The nearest I can find is the GGR150.
Demontweeks used to do the exact same one, but I would just use a GGR150 as at least you know the quality is there.
It is not exactly unusual for the BAILEY ones to stick, or to be open easy like yours, thier quality seems all over the place at times, NO "TUV"!!!
It needs stronger in your case, stretching it will not be any good as the spring has memory, hecnce it being a spring, it "SPRINGS" back into shape, ie length that it was made at, you could see if you could pack it out to increase pressure, or just get a GGR150 about £45.
tabetha