I love hearing from some of the more obscure faces of the franchise, and here's a great interview with Steinmann. It's from Stone Cold Crazy blog:
They passed on Savage Streets, but said I should call them as soon as I was done working on the film. They told me to come up to Boston and meet with them. There they offered me a two-picture deal: Friday V and Last House on the Left Part II. I accepted their offer and was instructed to do two things on Friday V. I was to deliver a shock, scare, or kill every seven or eight minutes. Most importantly, I was to turn Tommy into Jason.