Back-lock to Slipjoint Conversion - TACTICAL REVIEWS
The switchblade knife I had when I was a kid in Arkansas now, in retrospect, seems rather flimsy and cheap. Where can I find a high quality, durable switchblade knife? - Quora
Slipjoint to locking blade conversion - is it feasible?? | BladeForums.com
West German M7 Fighting Knife Conversion In Scabbard - MJL Militaria