Yeah they seems to be popular with trials hubs
https://www.bikenbici.com/b2c/producto/M-WASHERPRblack/2/screws-trial-wheel-washers-monty-prorace-black-biketrial
https://www.bikenbici.com/b2c/producto/M-HSWS/2/bolt-and-washer-monty-hub-set
https://wabicycles.com/products/wabi-replacement-wheel-bolts
https://www.trial-bikes.com/en/try-all-axle-washers-p-536803.html
https://answerbmx.com/product/answer-holeshot-mini-hub-washer-set-of-2/
Thanks for the links! A mate has some halo bolts in stock in his shop though he couldn’t remember what size they are - I’ll give them a try.
Although a qr skewer does seem to be working just fine for now! :-)
@AlexD started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Yeah they seems to be popular with trials hubs
https://www.bikenbici.com/b2c/producto/M-WASHERPRblack/2/screws-trial-wheel-washers-monty-prorace-black-biketrial
https://www.bikenbici.com/b2c/producto/M-HSWS/2/bolt-and-washer-monty-hub-set
https://wabicycles.com/products/wabi-replacement-wheel-bolts
https://www.trial-bikes.com/en/try-all-axle-washers-p-536803.html
https://answerbmx.com/product/answer-holeshot-mini-hub-washer-set-of-2/