SC8UU replacement for IGUS Drylin RJ4JP-01-08 (LM8UU)

I wanted to upgrade my LM8UU to IGUS Drylin.
First attempt was to just swap LM8UU in the existing aluminium SC8UU by IGUS Drylin RJ4JP-01-08.
Result was a lot of bearing clearance.
According to datasheet, the IGUS drylin bearings need to go to a percision machined hole setting a certain preload.

I looked for some printable SC8UU replacement with possible good preloading / clamping.
Found nothing applying force on all circumference. I didn't just want to clamp the IGUS drylins in one direc