JANOME DOUBLE SPOOL ADAPTER

This is a DOUBLE SPOOL ADAPTER for Janome 525S. Need M4 threaded rod or any rod to stick in the adapter, but it's designed to fit the M4 tightly.
(I hate installing top thread on the sewing machine everytime I need to create a new bobbin spool, so I have two spools ready - one for the top thread and the other for making new bobbins.)

If you have other sewing machine, you printed it(just print the adapter.stl it's fast easy print) and it works for you, let me know I will add it to the compatibility list.