Part of me doesn't want to be defeatist and back in the day most gunsmiths made their own tools; the other pat of me realizes that the cost of buying a commercially made broach divided up between the 6 hammers i need to fit makes the broach about 20.
130 quid is a lot to spend on a square hole.
http://www.steelmans.co.uk/?92,5mm-square-broach
I think i will have to try first, even if my home made broach completely cocks up i can order a new casting for less than the cost of a commercial broaching tool.
