A spare or replacement top cap for Leonelli magnetic Stop / Kill switch, also sold as Jitsie and Apico I believe. Also fits a generic switch bought from Ebay.
Requires a 10mm dia x 5mm high magnet (or 10x3 works, just put a couple of mm of filling behind it).
Accepts standard 10mm flat boot laces for the lanyard (melt the surface of a 25mm length at each end with a soldering iron or lighter and fuse the flat surfaces together to join)
Includes a bead to tighten lanyard around your wrist.
Insert your magnet carefully, keeping it straight. Once pushed home a quick heat with a lighter or soldering iron etc. will allow the lip to be pushed over to hold it in place.
NOTE: the orientation of the magnet is important for the switch to work, check your switch before inserting magnet. My Leonelli and Ebay switches use opposite polarities.
I printed in PLA with a brim to provide enough adhesion.
Supports were from build surface only (or it will fill the lanyard hole).
The bead was a little hard to snap out, but using a small rod it levered out cleanly.
Snap off the raft, supports (the top of the dome has a support, make sure you get it all off) and lever the bead out of the centre.
Probably a good idea to clean-up / chamfer the lip before inserting magnet.