I have been scratching my head for one straight day about this. My Krink underfolder flat is bent straight, but the rear trunnion holes for the underfolding stock are off by almost 1/8". The trunnion sits a little higher and back, but the holes on the flat are lower and forward slightly. I did some more bending/hammering and managed to square the receiver better. However, there is still a misalignment with the rear trunnion and all holes pre-drilled with this AK Builder flat. I googled around to see if anyone had a similar issue but to no success for a Yugo build. I did see one issue with a Polish Underfolder, but that was on a completely different forum.
Are alignment issues common with new builds? I know that I am basically taking parts from a foreign country and mating them to a stamped template with pre-drilled holes. Not everything is going to be perfect. Nevertheless, I'm ready to dig out the dremel and expand ALL rear holes ever so slightly to get everything to line up. I'm still grinding my teeth in confusion thinking I did something wrong.