Spoil Boards
From PROBOTIX :: wiki
Making a New Spoil Board
The above file can be used for cutting your own spoil board sized for Probotix machines.
Un-installing/Installing the Spoilboard
It helps to use M5 studs to hold the t-nuts in during removal or reinstallation of the spoil board. You can cut the heads off of longer M5 screws, if you cannot find M5 studs. The studs will also work as alignment pins during reinstallation.