Ordered a set of aliexpress HGR20s (they're the wide so that might not be the right designation) rails/blocks (2&4) for way way way too cheap. I only ordered the one set figuring it was too good to be true so I'm good with fiddling.
Some of the blocks have a distinct bearings moving feel and don't seem to slide that easily. I want to say they have a detent feel to them as it feels like it stops every <whatever the diameter of the BBs are>.
Initially I thought maybe lack of grease, but that showed up last night and that didn't help. Although my hands are silky smooth this morning.
Having no experience with this style of bearing, what should I be expecting in movement? Slides easily with finger pressure? No bearing movement feel at all?
If I pick 1 set up by a block such that the 800mm rail is verical, should the rail & other block slide down?
I didn't get a chance to research bearing size/preload, any good links for rebuilding/sizing?
thanks!!