My background is engineering but I'm now retired. I enjoy making bits like this but I do it the hard way, hacksaw, files, grinders and polishing wheels in a pillar drill. A modern CNC machine would knock stuff like this out in minutes.
I just used what I had lying around. Aluminum angle 5mm thick.
I marked out the hole and cut it out using a large drill (2 holes) and then a hacksaw.
The hole was then finished using a 'dremel' with a rotating sanding tool.
I then marked out the exterior shape to match the hole and roughly cut it out of the aluminum.
More filing and sanding to get the shape I wanted.
Then polishing mops in the pillar drill to get the finish (dirty job with aluminum)
Finally I drilled a 6mm hole to take the mounting bolt.
I cut the outside of the rubber original part off leaving a 'grommet' to bolt the piece to.
Used a locknut and tightened it just enough to allow it to swivel under pressure.
The finished item weighed only 16 grams.
Hope this helps anyone who fancies having a go themselves.
Gary.
