This is my "quick&dirty" way: just put 5g or 80gr of pellets inside my hammer, place it over a flame and wait till the lead is melt down. Let it cool on a flat, regular surface and you are done. Also remember that, if you want to remove the added lead, you just need to turn it upside down and warm it u til the lead fell off. If you want to try with a door pin, remember to polish pin, spring and hammer. A nice chamfered hammer entrance will be good, also.
A good metal to metal or metal to carbon solution for a non-permanent bond for the hinge pin to hammer might be point insert "hot melt"..an archery product that's easily removable with low heat but is capable of withstanding repeated impacts.This, I have several sizes (weights)made from hinge pins, they are an ideal McGuyver solution!
The chamfer at the back of the hammer is the first thing I did, that helps the cocking effort and feel. I do indeed polish the hinge pin, as well as the hammer. I also use self stick teflon glide tape on the inside of the left cover plate, where the cocking block slides. All these things add up to a smoother (but not smooth) cocking effort.
Are the diameters of all the RTI barrels so far the same? What IS their diameter (16mm)? 
www.airgunnation.com 
Interesting, will you post a picture when you receive the barrel.I realize this thread is a few months old, but I am passing along what I learned today. I am getting a Prophet Performance 2.1 in .22 caliber. I want to shoot the 25.39 Monster Re-designed pellets out to 100 yards, especially now that JSB has the deep skirt/shallow skirt mixed in tins issue resolved (hopefully).
Great news... JSB has new offerings coming your way!!!
Remember when the Monster Redesigned (MRD) pellets first came out? Well you and everyone else did and you all remembered them having really deep, thin skirts. They were really missed. That was the 2023 number one question we were asked at every event we went to, on emails, even the big...
I ordered a LR barrel from the RTI shop in Spain. They wrote and said they did not have any of the 2019 barrels with the 1:32 twist. They said they had a newer better one. I assumed it was the RPB barrel with the 1:16 twist. Then they said they shipped it. I called them and now I understand.
The new LR barrel is available. It still has the 1:32 twist like the old one, but it has the new improved transfer port of the newer barrels. The only thing that is changed is the transfer port. I was relieved to find that the 1:32 was still available as it's the better choice for MRD's at high speed, out to 100 yards. I will keep the RBP barrel which is good for pellets at slower speed/shorter ranges and slugs.
www.rtiarms.shop 
I realize this thread is a few months old, but I am passing along what I learned today. I am getting a Prophet Performance 2.1 in .22 caliber. I want to shoot the 25.39 Monster Re-designed pellets out to 100 yards, especially now that JSB has the deep skirt/shallow skirt mixed in tins issue resolved (hopefully).
Great news... JSB has new offerings coming your way!!!
Remember when the Monster Redesigned (MRD) pellets first came out? Well you and everyone else did and you all remembered them having really deep, thin skirts. They were really missed. That was the 2023 number one question we were asked at every event we went to, on emails, even the big...
I ordered a LR barrel from the RTI shop in Spain. They wrote and said they did not have any of the 2019 barrels with the 1:32 twist. They said they had a newer better one. I assumed it was the RPB barrel with the 1:16 twist. Then they said they shipped it. I called them and now I understand.
The new LR barrel is available. It still has the 1:32 twist like the old one, but it has the new improved transfer port of the newer barrels. The only thing that is changed is the transfer port. I was relieved to find that the 1:32 was still available as it's the better choice for MRD's at high speed, out to 100 yards. I will keep the RBP barrel which is good for pellets at slower speed/shorter ranges and slugs.
www.airgunnation.com 
