I purchased model VML-1500 and the documenetation states that the air supply connection to the foot valve is a 1/4 x 19. I've tried a male quick connect 1/4 NSP and am unable to get the fitting started using fingers only. actually it will start and that's all it will do! I don't think it even goes 3/4 of a turn and jams. Checked online and 1/4 x 19 lists as being BSP and clearly states that the two are not compatible. So I'm looking for a quick connect BSP 1/4 x 19. Anyone have one of these lifts?