Rock Tumbler ball bearing end stop

I designed these ball bearing end stops to replace both of the cheap plastic stops on my Chicago Electric rock tumbler. http://www.harborfreight.com/dual-drum-rotary-rock-tumbler-67632.html Should fit the single drum version also. It uses the factory screws and factory screw locations. Uses 2 F606Z bearings that I had left over from another project. http://www.ebay.com/itm/10-pcs-F606ZZ-F606Z-Metal-Shielded-Flanged-Ball-Bearings-6-x-17-x-6mm-/371789715486?_trksid=p2141725.m3641.l6368 Printe