Marrakai has it nailed. Most Webley actions have a non removeable pin, and the hook must be built up and re fitted. This is best and most longlastingly done by either tig welding or "spray" welding. some of the spray weld compounds are very long lasting, and "slippery". Rifles with removeable pins can have a new pin made. Some, like Purdeys have a through pin, and the new pin should be engraved to do a correct job. Hollands, on the other hand, have pin covers, and a new pin is not such a big thing. I just did my "new" .500/450. It took about 3 hours to remove the old pin, and make a new one .005 in. larger. It took another 3 hours or so to "black down" the barrels.

I left the action tight until I fired 10 rounds, and then relieved the remaining tightness. Most "smiths would charge $6-800 US for this work. I hope this helps, SXS