Allows you to mount an industrial bobbin winder ($16) and sewing machine motor ($28) so you don't have to run your sewing machine to do it.

https://www.amazon.com/dp/B077HMQ5B9/ref=sspa_dk_detail_1?pd_rd_i=B077HMQ5B9&pd_rd_w=pY6CQ&content-id=amzn1.sym.f734d1a2-0bf9-4a26-ad34-2e1b969a5a75&pf_rd_p=f734d1a2-0bf9-4a26-ad34-2e1b969a5a75&pf_rd_r=KYHZDTDE56DJWS74TYAE&pd_rd_wg=iJ07Q&pd_rd_r=55c16356-ee8a-4d9c-84db-1809f40ed415&s=home-garden&sp_csd=d2lkZ2V0TmFtZT1zcF9kZXRhaWw&th=1

https://www.amazon.com/dp/B07G9NFXN8?ref=ppx_yo2ov_dt_b_product_details&th=1

https://www.amazon.com/dp/B074C2XKXH?ref=ppx_yo2ov_dt_b_product_details&th=1