Alternative air pumps for ET2

The guy who bought my extremely cranky and unreliable ET-2 back in the mid-90s ascribed its difficulties to the Wisa pump that had come with it (purchased used by me). Said this happened all the time and that he bought them cheap and discarded the pumps. He told me this AFTER he had bought mine. An earlier ET-2 that I had owned, with the stock pump, operated perfectly. Dave

I wouldn't worry about screwing up the arm itself, Alun. I think the problem with the Wisa was too little pressure rather than too much, but it was a long time ago :-)