I have one of the B-78's from the 1970's - octagon barrel in .25-06. When I got it the half cock notch did not work, so I laboriously took it apart, fiddled and fought with it and eventually got it back together with the half cock notch working, and it has a decent trigger.
That was 30 years ago and I don't recall exactly what I did, but it may have involved shortening the coil mainsprings, which makes it a lot easier to stab the spring struts back in their holes. Or I may be thinking of a Miroku Low Wall I owned later on.
Mine is phenomenally accurate. Once I fixed a loose front scope base, it proved to be superbly accurate; no problem at all to put 3 in a 1/2" or less at 100 yards. Another member has a rifle identical to mine, and he's won money with it
So despite the lawyer-proof triggers, they are really good rifles, and worth some trouble. I think Lee Shaver used to sell trigger fixtures and instructions for the Miroku single shots; if he still does, that would be a good investment.
