As far as I know, only a hälsokostaffär; in some cities there are stores that specialize in foot insoles etc - they might carry various equipment. I went in to my local hälsokostaffär and asked for magnetic bracelets, but they only had some uglyass stiff band.
I searched the net for clamps and came up with nothing; not ELFA, not Clas Ohlson, not google-searches - nothing.
I did find a wrist wrap of neoprene on a net-company, but they were going to stop carrying it, and besides it was only over the net.
One thought I had for gripper pads was the rubber replacement pads for brake/gas pedals (20 kr at Biltema – hela familjens varuhus! - Biltema.se), but I don’t know if they are too soft.
I haven’t been able to come up with any other good ideas - yet - of equipment that could be converted for PE uses. Then again, I haven’t been to Bauhaus or K-Rauta yet.
regards,