You could try rolling ‘two pieces’ of high half round wire through
at the same time. Buy or draw down the highest D section wire you
can, fold tightly in half, the flat sides together, it should now be
almost like a round wire, ovalish?
Select the appropriate grooves and put the folded end in the open
grooves, tighten till the grooves hold the double wire, the slit
being horizontal. Wind the wire back out and tighten the rollers a
bit, wind through. Repeat process tightening a bit each time, Keep
the wires from going in skuwiff.
You could now try to draw both wires through a square drawplate??
Depending on the cut of the grooves you will get a isosceles
triangle with a flat top. Bit of filing needed? Experiment with short
For a 60 degree triangle you need to beg, borrow or buy a drawplate.
Tip: Start with round wire several sizes larger than your target
size. Have fun.