I have 3 of those machines (transmissive, transreflective and colour) for quite some time, and only one working pen (and they are VERY hard to find nowadays)
I know that there are compatible pens that work with st1000 (I tried the friends pen a long time ago, I think it was HP tablet? don't remember any more) .
Does someone know of compatible pen?
Thanks for any advice/info in advance!