Elite Drivo 2 Shimano 12 speed Drive side End Cap

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Hi, I have an Elite Drivo 2 smart trainer and I want to use my mountain bike on it. My bike has 148mm boost spacing and is 12 speed Shimano (I have an Ultegra 12 speed cassette on the HG freehub). I have purchased the
148mm non-drive side adapter buy it still doesn't work. The problem is with the drive side. The freehub retaining end cap screws in too far, so
when I put my bike in, the cassette lockring is hard up against the frame and obviously won't spin. So 12 speed cassettes won't work with this trainer no matter what the rear spacing of the bike is. I have searched
everywhere to find a longer drive side end cap for the 12 speed cassette but can't find anything. Could you please let me know where I could find
this part?? Thank you

[ymarti.ymarti]

maybe is useful

https://www.youtube.com/watch?v=7G0GyunAF8A