Hey Phil no problem.
The brass plate is for holding the recoil spring. The slide rods go through the tubes. Drill out the slider to 4mm and insert the tubes. This was a great idea he came up with. Takes the slop out and reinforces the slider. Which micro switch. The one on the servo, it controls which MG I want to fire and the ones in the turret control where the main gun stops. No more chicken head bobbing.

Richard