Tripod Top Cap
Here is the partially machined top cap. I had a pice of aluminum in the pile and used that, but the next time I would do a lost foam casting and machine from there. The odd looking reliefs and the tabs shown were machined by chucking the part in an eight inch indexer I have. The part was them clamped on the 12 rotary table and the excess was machined away. The leg bolt holes were reamed for a good fit on the pivot bolts.
Here is the first test fit of the parts.