Originally Posted By: SR4759
For a reciprocating tool you might search at

Gesswein.com
The UHT Ushio Turbolap Filer looks interesting. The Yellow Tool has a 1.2mm stroke that I believe would be perfect for checkering. I have no idea how difficult it would be to adapt a checkering tool to fit the handpiece. These tools are only $435, so someone on this forum should buy one and try it and report the results.