Finally got my snowblower on the tractor and hooked up & running good,My ptoblem is i push the button down on the lift arm,blower goes down no problem,,,but when i raise the blower the lift arm won't lock in the raised position while i'm pulling with both arms. The only way i get it to lock in the raised position is to hook a rachet strap to the lift arm & the back fender and tighten it till it clicks in. Do they make a longer or an adjustable lift bar for the snowblower???? It's a 1972 cub 108 with a QA 36 snowblower