Not me, not this! I only had this little brainwave last night. It's a short lived one too, because I failed to take into account that I would need to subtract the bearing spacement off each end of the bed. If I kept the bearings sandwiched together I could still gain 50mm travel, but viability aside that's a lot of faff for 50mm!

It was late when I wrote the post and still early when I unlocked my phone and realised I'd fell asleep before I'd finished writing it. A well excused brain fart I'd say.