[skullworks]

You want a real seller. Its just what you said.

Design a good 2 or 3 speed belt drive conversion for the RF45/Zay/IH heads that gets rid of all that hideous gear noise and allows the user to run a VFD. You just do the belt drive, let the customer source motors and VFD if they are not content with the OEM supplied motor. Just spec out what flange size options and shaft sizes you can support.

Another seller would be a 2 or 3 speed belt drive conversion for the X3 mills. No one has this on the market yet, There is a pulley swap set to double the speed on the SX3 but its a single gear speed, with all the compromises a single gear has.

You would out sell the makers of CNC conversions because the spindle speed issue plagues all users. not just the CNC crowd.