My girlfriend requested a larger attachment for her LAMXD wool winder off of Amazon. This one is the largest that you can fit onto it without the spool hitting your hand. 

I included a test-print of the locking part of the ring, it should be a pretty fast print. You should probably try that first - it is short, so don't attempt to fully lock it as it may be difficult to remove. It should just slip onto the base while being mildly snug, and you shouldn't have to force it. 

The main print unfortunately prints in a non-ideal orientation (upright), such that there is a lot of support material on the bottom. However, assuming your supports are half-decent, it should clean off pretty well and will generally not be very visible. 

Printed in ABS since that's what was on my printer at the time, and it appears to have worked well (accounted for shrinkage in the slicer, NOT the model). 

I've attached the STEP in case adjustments/revisions want to be made. Will attach “real” images of it soon.