On 10/11/2016 11:20 PM, DoN. Nichols wrote:
....

I think that for a lot of farm type applications, square holes
for carriage bolts were made by a square shaped taper punch with the
workpiece heated red hot and the work done on an anvil. But a square
broach, even new, will probably cost less than a forge and an anvil if
you don't have those.

Indeed...still have grandfather's old anvil and some of the forge tools,
but only the hand-turned blower (and it's froze up; have thought often
would be neat to get it working again but never gets up to the top of
the list in all the other things to do) left of the actual forge...