just bought the chainsaw from Home Depot for clearing my trees after the hurricane IKE. wanted to tighten the chain and opened the cover but cannot put it back I thin there is an spring like Oring inside the cap that prevents it from closing. I tried half a day but could not figure out wheather the metal ring has to be inside the reciptor or outside. may seems like a simple fix but has gotten the best of me. I hope the part is not defective or damaged since I just started using it. Please help. I got broken tree all over my yard. Thanks Moe Salehi Houston, Texas