I've got a watchmakers lathe that's lived under the bench for the requisite period and now I want to put it to use. I have a motor but no belt, but there's some belting on eBay at
(it's item number 190056470226 in case the link screws up).
Question is : my lathe has vee grooves on the pulleys, so will this circular x-section belting be OK ? Also, the grooves are big enough to take any of the 3 sizes (3mm, 4mm and 5mm) so which is better ?