I have got to make two special 7BA hexagon headed bolts with a 3mm diameter fitting area in the middle. Not an off the self item! I shall have to machine them myself, but finding a small length of 0.170″ hex bar is a bit of a problem. Kennions have the bar but with the postage costs it becomes expensive.
If I had an indexing fixture it would be no problem, but I haven’t. I think I shall have to put a hole down the centre of hexagon bar to hold a piece of round bar so I can use it to index the six sides on the round bar. Now, have I got a piece of hexagon bar big enough? Never stops !!!
Neil