thank you for that. Looks like I needed to mount them before I assembled those pieces. I am guessing it is the same as on the Primo. hmm. Ok, not sure I am willing to dismantle this right now so maybe i will try and make it work without them.
If you use the “standard” endstops you have to wire the outer two connections and leave the middle one, then you have a normally closed connection, which is what we want to be able to notice when a wire or connection are broken.