I removed my deck today (48" GHD) to do some cleaning & now I can't get the shoot to line up into the fan housing thingy whan I tried to install it. The shoot needs to go a bit higher to line up but it hits the underside of the mower... what am I doing wrong??!! Everything else is fine, guide pins, drive shaft etc,,, I only have 15 hrs on the mower so I'm hoping that I am just having a stupid moment. Please help!!