This is just an add-on to "TUSH - The Ultimate Spool Holder", which I like very much.
The purpose of this add-on is to hold the shells together that secure the bearings without needing to glue the pieces. It also enhance the overall stability to the system to avoid overturning the spool. The distance between the clamps is adjustable to suit any filament roll width.
Monoprice Mini IIIP