Heat-Set Insert M3 Belt Tensioner

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5137919.

Made the bolt aperture wide enough to fit a M3x5x4 heat-set insert to avoid stripping the thread or having to fiddle around with M3 nuts. Two versions, one slim and one with about a 5mm depth for the insert, because the slim one makes you under, or over-insert the brass part.