You guys know I snagged a Bonney razor knife awhile back. Only thing was, it was the older no-retractable blade style. And i really didn't want to cut my pants pockets - or worse my leg! Tried several ideas, none really worked.
Then I found this ABS shop vac attachment, and adapted it to my needs. Seems to work fine!
I heated the outside with a Bar-B-Q lighter until it softened, then jammed the knife body into it to set the shape. Once cooled it was perfect! Only thing was I had to heat it so high the outside surface started to char. So I covered it over with a layer of ABS cement. Then attached one of those cordless drill belt clips, and painted to knife logo. Came out well!