I believe you are refering to this item:
http://smllengns.tripod.com/
The concept is a great idea and makes alot of sense, especially with wet, watery snow. A snowblower is nothing more than a glorified pump. The tighter the clearances, the better the performance. I bought the impeller kit, but I am having second thoughts when I heard the mention of projectile.....or, lets say a nut or bolt gets loose, etc. I'll bet it would be OK if elastic stop nuts were used (those nuts with a tiny ring of plastic inside that you can't tighten by hand and need a wrench).
I also called Ariens Tech Supt and they were fully aware of the item but the lazy $5/hr ding-dong said he never brought the issue up with his engineering dep't nor did he know if they were considering it. What a dolt.
I have a welder and now that I think of it I may WELD some tabs onto my impeller to tighten up the clearances. I have about a .25" - .38" gap in mine!....its pretty big!
I may 'proto-type' the idea first with the rubber and see if it works. If it does not work I can easily fill the holes w/ weld. I can back away from the idea with minimal inconvenience. If it does work I can easily fill the bolt holes w/ my welder and weld on steel tabs, which is a fair investment in time getting the clearance on each tab JUST RIGHT, making sure the same ammt of metal is used (balance), etc. Probably a better job to do on a nice spring day with a beer out in the garage.
I'd have to say from a conceptual standpoint its a good idea and I doubt the guy is a liar (see his before & after pics). I think the bigger issue is maintainence and wear. Lets say you suck a rock in. It will probably damage the rubber although you can flip the squeeges one time. If you have a gravel driveway I'd say no way to rubber.....
Comments?..........