Will do, i've got another pump but its silver so not ideal as the lamp is gold, i'm just soaking the pump leather and i will try that as well but i don't imagine it will make any difference.
I think i've cracked it, there was a thin smear of dirt or grease on the mating surface on the underneath of the screw on clamp, i've cleaned that and no more air bubbles so maybe it was just air escaping from the pump itself, thanks everyone that gave their advice, much appreciated
Cleanliness is godliness in this trade. I'm glad you are back in business with your Tilley. Cheers Tony
I can see that now, its all good experience especially now i've just bought six M320's oh what have i done haha, Thanks for all your help