IHP rear sight mini project

[fantumfan2003]

I have IHP rear sight on the SPAR and the IHP35. Both were horrible to shoot with.

The original sight on the IHP 35 was crooked and misaligned and the windage screw needs a screw driver to turn it.

On both sights the elevation screw and thus elevation alignment were flaky, shaky and unreliable.
Neither sights had the firm and positive clicks I get on my Diana 35 and the spare M54 rear sight that Jeetesh gifted to me.

I came across a couple of IHP 35s from yester years in the past week and got a good sense of how the rear sights actually worked. I figured by substituting and cannibalising I could get to have one sight which was to my liking.
So some spares from the SPAR's sight, with some filing of the the top and bottom housings and some parts from the IHP 35 rear sight were put together and I managed to have one sight which was parrallel, true, not crooked etc. to my liking.

The positive clicks on elevation were still elusive and I determined correctly that the elevation screw needed to stop earlier than designed, when rotated to move the sight downwards. I jammed in a plastic spacer about a millimeter thick in the bottom housing of the sight underneath the elevation screw (marked with yellow arrow). This did it, now positive clicks were indeed positive.



The IHP 35 front sight was tilted to one side because one side was slightly longer by about an mm again than the other. I filed away the extra metal and cut in a new groove with a triangular file, this again got me to my true, parallel, not crooked paradise.

Before final assembly I applied machine oil to the innards as there wont be a need to open the sight again for quite some time.

I will zero the IHP 35 with the "new" sight later.

It was a good learning experience, but reflects very poorly on IHP manufacturing and quality control (if there is any).

I dont think I will buy another new springer from IHP. The older ones are worth putting money on. My worry is they will make a mess of the new PCP models Prodn. and QC, they did mess up with the side lever match pneumatic manufacturing and QC, inspite of having a good design from the doc.

Really curious to see how the Chinese stuff is, Keeping my fingers crossed and I hope I land one from Jonah.
Should also be able to make an interesting Hindi/Chini comparison.

Manish

[lazybones]

Nice work Manish.
I've been going bonkers trying to figure out what to do with two sights on IHPs belonging to friends.
Thanks for the insights. I'm looking for the circlip (circular lock washer) that hold the end of the windage adjustment screw. let me know if you ever run into a couple of spares.

Ashok

[pkjeetesh]

Manish....there is a fair deal of work to be done on an IHP...I had ordered for a spare trigger and rear sight from Aimco including a variety of trigger springs....asked him to check closely before delivering them...these are the following QC problems that most IHPs have
1. Rear sight - hopeless build quality
2. Barrel chisel dent and lock pin - improper spring tension - you have to experiment with a variety of springs in
order to achieve smooth and perfect lock up
3. Receiver - when we ran a bore gauge through it, the internal diameter was found to be varying between .1 to
.3mm. MOC is soft, believe it or not the CFX stampings took a while to clear using a needle file
4. Spring guide - loose fit on spring; guide washer loose fit in receiver and end cap - this can cause the piston to
lift while cocking and damage the rear of the receiver, exactly under the scope rail
5. Piston - rod not centered
6. Cross pins - holes not in line with piston rod
7. Trigger - clickety clack and with lots of side play
8. Barrel - bent either upwards or downwards, I have got one in each case
9. Breech block - side play as you shoot more

I dont know how people have won medals with this gun...you have a better chance of winning at 10m if you throw the gun at the bull each time someone was asking for GNW spares...I have a GNW with me...I only look at it all the time wondering what to do with it...in this one the receiver itself is bent...beat that

Lets see if the Chinese are any better

[lazybones]

...in this one the receiver itself is bent...beat that

That's not a QC problem PK. It takes tremendous engineering talent to bend a receiver

Ashok

[pkjeetesh]

just exaggerating lazybones it seems bent...and of course we have rare talents in our country

[fantumfan2003]

Lazybones,

These circlips are fairly common in tape recorder mechanisms. I wil visit the electronics market and see if they still seel them. If not then will have to speak to doc.

I'll do my best

Jeetesh,

While training for 10 mtr open sight competition, I have been having problems with IHP rear sight (its the same on 25, 35 and Pneumatic) from day one. I am more hopeful now. Will try the new setup at the range tomorrow. I need a predictable setup for competing in 10mtr open sight. If I feel the IHP wont do the job, I will straight away put the Diana 54 / 34 rear sight on the IHP pneumatic (its a staright no hassle fit) and use that. Pitty our people cannot even copy Diana's 30 year old design properly.

I am also toying with the idea of designing my own rear sight, nothing fancy will keep it simple with screws for windage and elevation

Manish

Nice work Manish.
I've been going bonkers trying to figure out what to do with two sights on IHPs belonging to friends.
Thanks for the insights. I'm looking for the circlip (circular lock washer) that hold the end of the windage adjustment screw. let me know if you ever run into a couple of spares.

Ashok

[pkjeetesh]

Manish...designing your own rear sight seems a better idea...a single lead screw with bumps on the upward plane I think will do...you will achieve a proper linear movement...same for windage, minus the bumps...Im no accuracy freak hence did not toy with the idea...

Best of luck ....Jeetesh

[archer]

Hey Manish,

If you are heading of to the electronics market, try out lamington road, grant road (E). I have spent quite a few evenings exploring lamington road(its the mecca for us engg students). The best place to find spares for tape recorders would be the road behind the police station. There is a small lane adjacent to the bridge, you should find stalls on either side of the road stocking all kinds of spares.


Regards,

Parag

[fantumfan2003]

Yes Parag

Thats the place. Its a small world I used to do the same.

Manish

Hey Manish,

If you are heading of to the electronics market, try out lamington road, grant road (E). I have spent quite a few evenings exploring lamington road(its the mecca for us engg students). The best place to find spares for tape recorders would be the road behind the police station. There is a small lane adjacent to the bridge, you should find stalls on either side of the road stocking all kinds of spares.


Regards,

Parag