I bought some cheap clone rail and carriages

[Desertboy]

I have done that and agree. But all went well when i opened carriages, cleaned them from scrap , lubricated them and problem solved. Work fine

Should I strip the "junk" carriages, try lubricate and reassemble?

I have nothing to lose I guess.

Out of 6 clone rails, 12 carriages I've had 2 junk carriages so far but I paid £63 delivered for 2 * 1.5m 15mm rail with carriages which makes the carriages more than "free".

They screwed up the listing should have been £150 but still honored it I wonder if they picked the worst one to send me lol.

As it happened I had 2 spare carriages and have ordered full set of original Hiwin's to replace them with when they finally come.