How to make a "D" shape pivot hole?

Santi, I saw a trick in a book where the maker drilled the hole and then took a flat end punch and smashed one side of the hole enough to push some metal out to form a flat spot, making a d shaped hole. It might have been in Terzoula's book, but I'm not sure.
 
Santi,

If you're trying to keep the pivot pin from rotating why don't you try the Tom Anderson trick. Drill and ream one side of the frame to a size slightly under the diameter of the pivot pin so that you can then press fit the pin into place. The other half of the frame you drill and ream normally. Doing this definitely keeps the pin in place and it's a lot easier and more accurate than messing around with punches and risking warping your frame. For a 7/32 pivot pin the corresponding press fit size is 5.5 mm. Hope this helps. :)
 
Thanks! :)

By the above answers, can I assume that Kit uses laser to do his pivot and Tom uses a stamping? :confused:
 
Santi, Tom drills a 3/16 hole. Then he reams the hole with a precision reamer to 5.5mm. The drill bits and reamers in this size are available from MSC. This is for a 7/32 pivot pin size, other sizes would vary and I don't know the numbers off the top of my head. The idea here is to have the hole be really tight so that the pivot pin won't spin. You can always take it out with a punch and mallet if you need to work on the piece without the pin in place, but if you plan intelligently you can get most of the shaping of the pieces done even if it's in place.
 
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