The rear shock design on the Proflex is always an issue when the elastomer/ODS/Noleen shock eventually dies, it's just not compatible with modern shocks.
Luckily I managed to get an adapter which allows fitment of a Fox Float shock, it was from a member on the idriders Proflex forum (he's also a member on here) although it was a strictly limited production run.
Probably your best bet is to find a used Noleen damper, they do come up for sale now & then, and there's often cheapish Proflex bikes on ebay that you could cannibalise for the shock.
I think there's a few motorcycle places in the UK which will service Noleen shocks, search on here & you should find the names.
The other alternative is the Risse dampers from the USA, they are really good and worth the money, it may seem expensive but if you plan on keeping your Proflex for a few years then compared to a modern Fox shock etc it's really not that expensive tbh.
Luckily I managed to get an adapter which allows fitment of a Fox Float shock, it was from a member on the idriders Proflex forum (he's also a member on here) although it was a strictly limited production run.
Probably your best bet is to find a used Noleen damper, they do come up for sale now & then, and there's often cheapish Proflex bikes on ebay that you could cannibalise for the shock.
I think there's a few motorcycle places in the UK which will service Noleen shocks, search on here & you should find the names.
The other alternative is the Risse dampers from the USA, they are really good and worth the money, it may seem expensive but if you plan on keeping your Proflex for a few years then compared to a modern Fox shock etc it's really not that expensive tbh.