I need to make a relief valve for the Type 65 Norman supercharger in my recent posts. To do this, I need two aluminium pieces machined up - a triangular one, and a disc:

Whilst I can cut plate, I can't turn/mill the 1.35" "indents" in each piece (the indents are used to locate a grey motor valve spring). Drilling is not an option as the point of the drill bit would push too far into the ally.
I'm looking for someone with a lathe/mill who is willing to make these up from aluminium. Happy to pay for both time and materials. For now I only need one, but would be willing to purchase up to eight (eight discs, eight triangles). I can probably get this done through one of the local machine shops, but would prefer to keep it on the forum if I can.
Cheers,
Harv