SC20UU

Order SC20UU designed for LM20UU coupling as described in the link below.

I used M4 type drill with standard nut for easy on-site fixation. The weight that will be under it is very little and the M4 screw is more than enough.

The pressure ring channel gap should be sufficient to hold it tightly, avoiding clearances.

https://pt.aliexpress.com/item/Free-shipping-LM20UU-20mm-Linear-Bushing-CNC-Linear-Bearings/921315652.html