working on 1936 standard 12. Bought all parts new from Midwest. Locking block latch won’t work. Reinstalled old latch and speed function works great. The problem I’m having is when you load second shell. First one in magazine tube) it comes out of tube and hits shell stop. Then new lifter hits rim of shell and lifter is difficult to push down. Anyone modified lifter( front piece) to make this work correctly? Any help would be appreciated.