I received yesterday smooth rod sample from one of the local suppliers.  I’m pretty sure something is wrong, but I have no idea if with the rod, or the bearings. Take a look how it behaves:

I must admit I expected it to slide smoothly along the rod, and even when I tilt it vertically – the bearing just sits there, on the top, until I pat it! This doesn’t seem all right… Also a certain stuttering can be felt when you try to slide it.

Funny thing – I cooled the rod to below 0 degrees centigrade (just put it in the freezer actually), and suddenly it slides perfectly! The question stands: is the rod too wide, or the bearing too tight…….?