M42 to Canon EF-m Adapter for Vintage Lenses, adjustable

This is an adapter for EFM Canon cameras to the M42 mount. The length of the adapter is adjustable to adapt it precisely to any old vintage M42 lens. I would glue the adapter parts together after I adjust the adapter length.

Adjustment Instructions: Focus to infinity and aim at object far away. Adjust the M42 adapter against the EFM base until the picture in the viewfinder is completely focused. Then use glue to make the adjustment permanent if you want.