Really need to edit the title to include 'triangle'
I suspect that this falls into the category of the 'bleedin obvious' for most of you but for me it was a revelation. Reading through the highlights of the changes in v3 it occurred to me that using twist to put a half turn into a solid strip and then flowing that onto a profile might produce a solid Moebius strip - and so it does.
Easy way that I've learned so far.

Mike.