I am sorry, but I don't know what a PDA is or a PM for that matter. My mother used a tredle machine and now my daughter displays it in her foyer, however, it is now in working condition at the present time. At one point in time, my father who was an electrician, installed a little motor on it and she had an electric machine. Later, that same little motor powered my yarn winder. I think that is the reason the tredle isn't working now. I have two Featherweights, and I love them. I can't look at this site often, but I do love it and look whenever possible.
Ann Eliz from PA