[Kevan]

What new feature Greg?

In the latest Beta (and the latest Alphas before that), there's a new "measure" tool. That tool also has a built-in scale option whereby you can measure part of the model, and then change that measured dimension to what you want it to be, and scale the model accordingly. I measured the part of the handle the ring goes over to be 10mm diameter. The ID of the ring is 10.5mm diameter. I set that to 10mm and clicked the Scale button, et voila! I just did the same for resizing the handle to better fit the slot.it size allen key (60% btw) and will report back how well that works for me. The new ring for the original print is almost done, so will be back shortly with pics and results.

I'm still on Prusa 2.5.1

...sounds v.useful though.