... that I appear to have "fixed" my erstwhile Chinesium P.O.S. lathe.
The drive belt that came with it was a flimsy glass reinforced nylon affair and it ran for < 3 hours before chewing itself to pieces and shedding teeth and the tension was so great it was causing the spindle to make a nasty "thrumming" racket.
In my view the "as supplied" drive-belt was undersized in terms of length at 445mm and they had wound the adjustment stops in as far as they would go and it was still over-tight.
The amount of adjustment was miniscule in any event insofar as the motor was mounted on 2 x M6 studs through 2 x 10mm holes, so it was only ever going to be able to move 2mm in any direction.
I filed the 10mm holes out to elongated "slots" of about 15mm to provide both UP & DOWN directions of adjustment.
I searched the web for nearest sized alternative belts of the same tooth pitch. One that arrived this morning was 475mm long, and while it fitted easily, it was far too slack.
So I took a 125mm length of 12mm box section and cut one side off of it to turn it into a C-Section.
I set this on top of the motor to provide a "packing" element and then wound the adjustment studs down onto it to level the motor and make it firm and the belt nicely tensioned but not unduly tight and snugged all the fastenings up.
Powered the darned thing up and blow me down it runs lovely.
No more shrieking and thrumming from a drive belt and no need to introduce a separate tensioning pulley. Result! As a bonus these belts are good quality, UK sourced and very affordable at < £5 in P&P a pop.
Now my Lathe adventures can begin.