Quote Originally Posted by tacfoley View Post
First thing to do is to get on to Peter Dyson's website and order a couple of spare nipple washers - made of copper, they act as a spacer to ease the removal of the nipple. A touch of CoppaSlip on the threads is good, as well, seeing as your new rifle has some serious age about it.
At £1 each I would look at fleabay. I have just had a quick look and you can get 20 for less than £2.

Dyson lists his at 8.5mm x 1mm. If you get the nearest it would not take much to file the hole out by 1/2mm, approx .020".