Initially they told me that, they have no arrangement for credit card direct payment, rather I should pass on to them my credit card details and they will charge. Since it was quite an embarrassing situation I arranged remittance locally there.

They shipped and when I reported them after a month that, where is the package ? they promptly thanked me for my patience and brought me the good news that the package is lost in transit .

The consignment was sent again and this time I was lucky enough to get it.
I dis-assembled the pump and fitted a few rings, but to my surprise it only lasted for few days. Again I fitted a new set today, it took hardly 10 minutes for me, but I have observed the pumps need care at least once in every 2 months, without which rings will never last.
There are one very important O ring, which terminates most and I have to have a stock of that only in future.
By the way, I tried to manufacture here the Viton rings, and I was quoted Rs.30,000/- for the first set of 10 for each class including the dye, may be later recurring cost would have been nominal, but I dropped the idea as it crossed my head

Any way my Benjamin is again functional and I am a happy shooter again

If these information are useful to you, I am a happy guy.
regards