Following OSTexo's Vimeo video on creating threads and after finding out about ShrinkTrimmedSrf I get to that point and when I try to use the command nothing seems to happen - the selected /separated solid threads just become deselected and points don't "shrink" - Am I missing something?

MOI (trial) is kinda funky on Mac, so maybe it's a Mac version short coming ?

MOI 3 trial/Mac OSX 10.11