August, perhaps not what you're looking for but I hope it gives you some idea. I've never seen any sort of animation on the 39, there was one for the 336 but now you have to sign up for the course out of Washington State. Mr fixi
Could be that, could be the locking lug is cracked from high-speeds(don't use!!!!). If the locking lug is intact, the lever end can be stretched a bit by careful peening. If the locking lug is cracked, you've basically got a parts gun unless you can find a wrecked gun and snatch the bolt out of it. Note that the tip of the lever IS what props the bolt shut. And the tightness of the takedown screw can affect headspace, also note that the lever rides on two tapered bosses, one on either receiver section.Great Pictures fixit - helped me a lot. I have an old 1897 from 1903 - and it misses a tiny bit when the action Closes to the breech. Looks like 110 years of use has grinded a bit on the lever and the breechbolt, where they meet - so it doesn't close completely. Have you heard of that issue? And what to do - only replacement?