Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Hello!
   I'm new here, and couldn't find this information in a search, so here I go: I have a couple of questions for anyone familiar with Ariens' late model compact snow throwers. I recently bought a used 5520 that I believe is a 2004 model. In testing it at home , I found that I can stop it's forward movement (wheels stop turning) by holding back on the handlebar. Not easy to do , but I can. Opened it up, checked belts and their adjustment, and condition and adjustment of the friction disc; all OK. Doesn't appear to affect operation, just wondering if this is normal. Second question: Is the newer 3 blade, 12" impeller/bucket ass'y a direct replacement? (Mine is 4 blade, 10") I've added a home made impeller kit, but am waiting for the next snow to see if it can do as well as my son's 2009 compact 20. Thanks.