Film Handler brake screw?

Hi all
I need some help on a replacement part for the film handler. I have the 72” film handler and the brake screw has worn out completely. This is the screw that goes into the film roller assembly.
Two questions – firstly, is there supposed to be a brake screw on either assembly? My machine only came with one. Secondly, where can I get these screws from? I checked out www.filmhandler.com and they only sell the repair kit for $15. That means I would have to spend $30 plus shipping for two screws. If they wear out that quickly there must be a place that you can buy quite a few from for a lot less?
Any suggestions would greatly be appreciated.

Thanks in advance

hardware store?

You should be able to find those at a Fastenal or Grainger. They are also referred to as a Spring Plunger.