Replacement pulleys

after some setting up and a good 9 months of use my pulleys aren’t too great.

didn’t receive a response on last post so can’t seem much of one o here but here it goes…

after replacing all my pulleys with some better ones,

couple of things,
where to get them where they’re NOT ludicrously priced as my local supplier wants £7.88 + VAT :open_mouth: EACH for the originals

id rather go for something that has a bit more meat on them for the threads.

so can the pulleys be changed for say… a 20t pulley? how would i adjust the calibration for this?

I’ve also seen the pulleys that have been separated to keep the two belts rubbing,… can’t seem to find them either now!

any help and advice will be appreciated