I would like to chip in on this old thread with a little detail of a way to permanently fix this issue. I'm riding on the shoulders of giants here (OP
) but just adding a little missing detail.
Basically, as we all know now, the Tacx design is poor and in reverse, i.e. if the sleeve had steel pins on the inside there wouldn't be any problem. Whether or not it's deliberate is also questionable... built-in lifespan
Anyway, however you look at it, exerting point force load on the spindle will without any shadow of a doubt eventually compress the urethane enough to allow rotational movement which will in turn snap the little spigots of urethane off.
The sleeve is 2mm SS and the distance to the centre axle is 14mm from the outer surface (12mm thick urethane)
The only way to ensure it never breaks again is to insert a stainless steel M4 grub screw after a little 24hr potting epoxy is dropped in the full bore hole. These are very cheap, very available and a 14mm screw will sit flush so you don't have to cut anything after... and they will look very pro!
For me, tapping the hole is not needed but if you want to do the max... tap the steel outer with a bigger size; M5 and screw in an m5 grub screw after a little epoxy.
I certainly agree with taping up everything and I also believe that taping over the screw and moving on to the next is a good idea also. If you use a long set epoxy it is very thin so seeps into the space under the sleeve IF the damage has got that bad. I will be doing this at the weekend with a Bushido spindle and will allow the epoxy to flow for 5 minutes for each pair before fitting the screw, taping over & rotating to the next. for the last 4 I will allow 10 minute a pair so it can seep into every space, topping up if needed. It really is like water for about 1 hour.
I have done carbon, aluminium and steel laminating/filling in the past and can recommend the slow but consistent approach.
Big thanks to all who have contributed on this thread, and to all those who are thinking about it?... just do it, its very easy to do! I've just taken 5 minutes to drill the holes so I could measure the depth.
I'll update after the weekend...