How to put together cut to length pushrods

I use the Comp set up to ream the end of the push rod and square of the push rod tube. I always cut the tube .010-.015 long and cut it down to size with the reamer. Also if you don't have a way to hold the push rod tube straight and keep it lined up with the cup end it will bend really fast and you get to start over again. If it wasn't that I end up making so many different push rods I would just buy them premade but I also hate waiting if them to come in when I want to finish a customer engine