Hi Dingus, I have a Pfaf f335 h2, havent had much time to do much with it yet. I suggest you type Pfaff 335 in the search box at the top of the web site. You will get a lot of hits, good reading. Look down the list of results for a thread titled "Help timing a 335". In this thread is a link to a Pfaff technical site. Follow the link and down load the pdf for timing a 335. The site is for the newer model 335 g, but the instructions worked for my h2. I am just a beginner but the pfaff document should help you equalize your feet height.
I am on a tablet at the moment and it would not let me link this post directly to the site. Hope this helps, Brad