Various parts for Chad Valley Mighty X-cavator 038

I bought a Chad Valley Mighty X-cavator 038 in a charity shop and it required some work doing to get it running. I had to 3D print a few parts.
I was asked to make these parts available. I had not intended to share them, but if they help somebody then that is fine by me.
The related playlist on YouTube is here -
Wire controlled Chad Valley Mighty X-cavator 038 https://youtube.com/playlist?list=PLA5a2xPRSrB32fhKSAp0vP0SPVvc-09oo