Nothing more than a standard crush washer. Any AR parts vendor will have them.
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Im with Belmont31R... "If you can't remove it by hand you'll be alright..."
DO NOT try to go another full turn from where it is now. :D
Some worry about needing to apply too much torque to properly time their FH which can lead to loss in accuracy, from what Ive gathered.
My guess is, youve probably hit the minimum of the torque range. -- a sweet spot IMHO.
Just to address your question... From my little personal experience, filing would be the best way to go. Slow and tedious but the smarter way to go.
Pre-crushing with a vise may lead to over crushing (like it did mine) in which case, you'd go past alignment and have to file it down just to get it back to pre-alignment. But again, yours is GTG to me.
Just a thought but you could install a flat washer(s) to take up some space before installing the crush washer to get the correct alignment.
LOL, I can see why the peel washers were discontinued....... what a pain in the ass they make trying to install and time a FH.
25 years in aviation maintenance, I’ve dealt with my share of components requiring fitting and installing of shims. Timing a FH with peel washers ranked right up there with the best!
Wouldn't filing it make it looser? Unless you are taking off enough to go through a complete 2nd turn..?
This is why I buy about 5 washers here and there. Just a slight variation between each one can make a headache turn into bliss. Just try different combo's until one lines up correctly without over torque or under torque.
My simple rule is a bit beyond hand tight is fine. I know its not by the book to the exact TM but it will do fine for 99% of the time. Ive never had one come loose or do anything but work as intended.
Just a bit of an FYI but you can spend 100-200 bucks and have tons of spare parts to keep on hand. Its a worthy investment as its a PIA to have to wait on a part to get your gun running or do some maintenance. Keep some gas rings, extractors, recoil springs, end plates, CH's, a bolt or two, firing pins, cotter pins, cam pins, etc. Just having spare parts has "saved the day" for many an AR enthusiast. Even 50 dollars a month to small parts is worthy, and in a few months you will have almost anything you can think of to replace at the operator level. I also keep a couple spare lower parts kits around. Those little springs and detents like to do the pole vault never to be seen again...