thanks for the info alex, i'll try the screw, dazmond i worked for 2 yrs with it on my back no problem now i have it on a sack truck, 1" hose on the tank so backpack fills in 40 secs , no winding hose in, no dog muck, no twisting into knots, yes i have 4 or 5 bigger jobs where a van mount would be faster but for the rest of my work the backpack wins hands down