Originally Posted by
Tartan
An exacto knife pressed in at the opposite angle of the little groove will pop off the edge of the spool and remove the slit. Of course the thread will still catch if the edge is not smooth so it might need a buff with an emery board. When I use a spool like that, I put it on my horizontal thread pin with the slit edge to the back.
I will have to add an exacto knife to my gadgets cup. Thanks for the idea!