The eccentric nuts were replaced by the eccentric spacers and nyloc nuts. The eccentric spacers are the tensioners. When you turn them with a wrench the wheels get tighter on the rails.
The Z-Probe will work with the X-Controller and the original X-Carve. You can’t use the Z-probe with the Aruino unless you are a ninja with electronics. We don’t have a support path for that approach but if you can hack it on your own go for it. However the original didn’t have the port for the plug so you will need to wire it manually. Also the Z-probe feature will be in Easel.
