You can buy a package of assorted shim stock from Brownell’s. Lock tight 680 works very well to set the shim stock on the barrel hook. Just experiment with various thicknesses to see what you need before permanent attachment. You tube has a video by Larry Potterfield illustrating the entire procedure. Interestingly he states that modern adhesives weren’t available to double gun smiths back in the day but don’t think they wouldn’t have used them if they were. I’ve used this method on several guns that locked up tight but had wiggle when the gun was open. It is very predictable, works very well, and is virtually undetectable when carefully done. Puts the lever back to the right as well. Tig welding the barrel hook also works but you’ll spend hours filing and marking and getting that done correctly. Another old timer once told me that if you like shooting old doubles you had better get familiar with shim stock. I was skeptical at first but it is effective and lasts well.
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