magnetic arrow rest for wooden recurve bow

This is a magnetic arrow rest for a wooden recurve bow. It is designed for bows with a wood width in the sight windows of about 17mm.

On my bow the thread for the plunger button ends with a round 'washer' with a diameter of 16mm, for which I've made a cutout. But there's a version without the cutout too.

additional material needed:
- set collar with 2mm inner and 5mm outer diameter
- a M3x6 hex socket cap screw
- about 10cm of 2mm steel wire
- a 5x5x1mm neodym magnet
- a little washer