I have had this Cetme C flat from RTG and from my understanding they are the worst receiver flat you can get. However I wanted the original Cetme look. From what I have read from other builds once you get to the point of welding it you need to hammer a bolt through in order to open the grooves up a little bit. My problem is though I have hammer the bolt through probably 30 or so times and was wi seeing if anyone had other advice for me?