I have a rather old hexagonal table that was left to me by my Grandmother. It has no value, but it is nice to have in the house.
There is a hexagonal shelf that is meant to sit about half way underneath.
How this was anchored originally I have no idea, but some ancestor decided that their way would be with a set of 3, odd, screws. The shelf resting upon the head of each screw. This was far from ideal so I decided to fix it, the modern way.
I created some 'rests' in CoCreate. Each with a 60 degree angle and a small hole for a screw:
I printed them in white ABS:
They fitted nicely with some small brass screws I had lying around: