I'm going on memory, being overseas right now. Someone, years ago, suggested sticking a couple of those wooden paint can stirrers/paddles in between to help keep the calipers open. I did that and it worked like a charm.
I bought speed bleeders ~4 years, I still need to put them on.

Blue/White 2007 TBA, Thruxton needles, Unifilter, AI removed, Polaris Bellmouth, Bubs, Nology Coils/wires, Lightbar, Ricor Intiminators, Hagon Nitros, Tall Sissy Bar w/luggage rack, Dart flyscreen & Lowers. 130 Mains, TrueGel Battery MG12-BS.