We purchased our Ryobi Expand-It Hedge Trimmer from G&M Supplies through an Amazon package. Unfortunately our first Hedge Trimmer would not operate properly on the Ryobi power head. After e-mailing G&M I was advised it was a problem they had encountered before, and to try a liberal spray of WD40 on the blades. This did not solve the problem, but after a further e-mail a replacement was despatched immediately and works perfectly. I cannot praise the prompt and friendly action of the company enough, it was brilliant! The only problem is that I now have no excuse for not trimming the hedges!