[AnthonyDV]

It would help if you could provide more details such as the dimensions of the press and broach. if the dimensions are close, and if you have a lathe with a 4 jaw chuck, you can bore a hole into the ram of your arbor press to fit the back of your broach. I also suggest squaring the bottom of the hole with a modified drill bit or end mill. This and the amount of broach that starts in the part you are going to broach can give you an extra couple of inches.