I'm looking to get a part created as a prototype which is extremely simple, but has to be extremely precise. The part I need has to be a perfect 30mm hemisphere to fit in to a cavity this size, and have some kind of small handle to be able to hold/remove it once inserted. This can be welded on if needed. It needs to be extremely well polished and smooth. It would need to be made of something non-corrosive like stainless steel. I do not know the tolerance of the 30mm in this case or how exactly close to 30mm it is (eg, 30.10, 29.80)- which is what I need to find out - so for this it might be ideal to have multiple parts made in very close sizes. Do we have anyone on OCAU that could help with this, or is this something I would need to contact an industrial company to get this made? If so, what do we think this might cost - both to prototype and as a manufactured part once I know the exact tolerances required?