Handle_v2 has a straight handle for uniform cutting action.

Designed to insert your favorite reciprocating blade for delicate work. The slot is for 1.0 mm thick blade, although some are thicker. Mark the blade for depth.

It takes some force to tap the handle onto the blade (oil?). There will be a nice round backlit hole when it hits home. I used a 6/32" x 5/8" or a 3mm machine screw to secure the blade. A longer bolt an nut can be use.

A file and sandpaper will clean things up and round the edges.