HGH20CA Carriage Bearing Retention Insert

This thing allows retention of the ball bearings in the raceway carriage when inserting onto the linear rail.

This is made for HGH20CA carriage types but may work for other 20mm carriages as well.

It fits perfectly in these that I ordered from Aliexpress.

https://www.aliexpress.com/item/20mm-Type-2pcs-HGR20-Linear-Guide-Rail-L1500mm-rail-4pcs-carriage-Block-HGH20CA-blocks-for-cnc/32826820615.html?spm=a2g0s.9042311.0.0.465b4c4dKeNwAK