My favourite machine (SF-2) has never played real fast, I thought it was just how it was. Compared to my "Fish Tales" and "Austin Powers" it was more (for me) fun to play but really slow, no quicker than my old "Hot Hand". One issue was on each side of the machine are holes where the ball is fired up (it appears most gottlieb DMD's have these in the same spot) the ball would not come out real quick and sometimes just roll straight out between the flippers no matter what. I rebuilt both these solenoids/coils and it made no difference....Anyway after shining up the paintwork on a motorbike with food grade aerosol silicon oil spray I decided I'd squirt some on the playfield and a little bit on the shafts that push the balls up. WHAT a difference!!!!...now the thing is playing like a cut cat and my average game scores have gone from 1 million to around 3 million a game, the balls fly out the holes, the bounce all round the playfield and the game is 100% more fun to play.
When I got this "cleaned and shopped" machine it was filthy and I spent a whole day with nifti, rags then millwax on the playfield...it made a huge difference but the spay silicon has just made it so much better again.....Im really hoping nobodys going to tell me it was a dumb thing to do and in a few weeks the playfield will peel off.