Okay, I see. I'll just get a quote somewhere locally. If you are checking the ballpark cost anyway for your own information, I'd still like to know.
I have simply assumed that the Al plate could be made thinner without losing too much rigidity,
and was planning on possibly having it made together with some parts for my 3D printer (5mm thickness, replacing lasercut acrylic)
if there would be enough gain in making a larger order (that would still fit the machine in one go) to come out cheaper than having
the throttle parts made thinner and ordering printer parts elsewhere from someone making batches of them.
I'm not extremely concerned with the looks of the lower throttle mechanics, as my ultimate plan is to make them innards under a faceplate.
I was considering a mechanism similar to that on the MFG crosswind pedals that would allow for the spring to be adjusted.
(threaded rod with hole through one end, spring fits through hole. Other end (through hole) with nuts for adjusting the tension.) That would also provide a swivel point.
On second read, I think this is what you meant?