While test fitting the rivets I recieved from K-var, in my Russiam AKM kit, I find the rivets for the lower holes in the rear block don't come thru enough to get any kind of hold. They come thru less than 1/16". Can I thin the area where the holes are, to get enought length to squeeze? How much rivet should stick through? On all the other rivets, there is almost a 1/4" sticking thru.