Thaks you all, guys. Well the problem with screws is finding one with round head, is made for flat scrwdrivers and isn't a wood screw. Here machine screws are common in allen or torx head, boating screws al almost AISI304 or other marine grade stainless steel, brass is mainly used in atique boat and for wood screws. The diameter of the head is also crucial, but it's on me to do metric conversions. The joke here is "Americans did a revolution to free themselves from an empire but they still use imperials", but we are simple folk: to count by ten is easier. On the weekend i will make the effort to put a macro lense on my reflex and try to shoot some picture of my breach and muzzle, i don't have a boroscope.
Quote from: Alessandro on April 22, 2020, 04:52:08 PMThaks you all, guys. Well the problem with screws is finding one with round head, is made for flat scrwdrivers and isn't a wood screw. Here machine screws are common in allen or torx head, boating screws al almost AISI304 or other marine grade stainless steel, brass is mainly used in atique boat and for wood screws. The diameter of the head is also crucial, but it's on me to do metric conversions. The joke here is "Americans did a revolution to free themselves from an empire but they still use imperials", but we are simple folk: to count by ten is easier. On the weekend i will make the effort to put a macro lense on my reflex and try to shoot some picture of my breach and muzzle, i don't have a boroscope. I think I have a brass screw I could send you if it's for .177. Just PM me.
So long as it is a true round head, I would not hesitate to use one with a different drive type. Can’t say I’ve ever seen a round head with a Torx drive though. Maybe a Philips. From what I’ve seen online, in stores, and hardware I’ve accumulated over the years, other drive types are almost always going to be a pan head, truss head, or some other semi-round head.
EdThe slot will hold any abrasive you are using, when the screw head is spinning around etc. Don
Thank you sir! A large portion of this guide is about addressing workmanship issues or things that aren’t really bad per se but just less than ideal. So for example you can reasonably expect a LW barrel to have a good bore but the crown, leade, andbarrel port are all at the mercy of the person who machined it for whatever gun it’s going into. Hopefully they’ve put in a level of care commensurate with the barrel’s pedigree but maybe not. If you are concerned about potentially doing more harm than good, my suggestion would be to at least push through a few different pellets, just as you’ve said, and inspect them under magnification.Personally, I almost always retouch the crown and I hit the leade if I can detect even the slightest smearing at the skirts. And if the imprinting of the lands onto the pellet head shows any striations under a 5x loupe, I go ahead and do the J-B bore polishing.