OK, breaking news! If you have been following the discussions about drum magazine deficiencies ... then you are aware it all comes down to fit & function! ... The fit part, as from now on, I have 100% cured!!!! On most, to a drop free empty condition!....
.....
As to function, I have determined that, although the drums vary slightly, the main issue confronting function is mainspring tension... as we have discussed at length... The repro drum springs are anemic, and barely work at their max preload!!!....
... and perform even worse as they unwind???
My G.T. replacement main spring is considerably better, as it is the correct width and length. Although it to has to be wound to the max capacity, it has the correct minimum tensions to operate the drum successfully and consistently. Or at least it has done so on my tests here at home...
.... But, it really needs a small increase in thickness on the added bridal spring to be exactly the same as the originals, which I believe would add just that little smidgen of extra strength so necessary for function thru the transition from mainspring to coil spring......... Sooooooo, you ask, what does this all boil down to? Well, on Monday, I'm going to re-order
more SAE1075 at .025" X .785 (.005" increase in thickness) for the bridal spring upgrade!!!!!!
again!!! Anyway, then they will be dimensionally perfect! And, I'll, of course, will have to sell three more! .....
......BTW, Jer, if yours don't function correctly for you, I'll switch them out at no cost, I pay shipping both ways..... (I think they will work fine though
) we will see! Best all, til....lat'r...GT......
BTW, when German engineers finally got to this point in their testing, they probably exclaimed, "Holy crap, it works!"...