Finally did this today. Basically took all day, some of it driving around for supplies, the other part the job itself.
Ended up getting 6 5/16x1 stainless bolts, 12 washers and nyloc nuts at Ace. Then I had to buy a drill extension thing at Home Depot.
Bought this, a 12" impact-rated 1/4" hex extension
https://www.homedepot.com/p/Milwaukee-1 ... /203820394
And then I bought this to stick on the end of it, so I could use any of my drill bits rather than buy a single long one.
https://www.homedepot.com/p/Makita-3-8- ... /100128244
Next I needed my rubber and I wanted a mud flap. Drove everywhere and no one sells them. Finally said screw it and drove out to the TA truck service garage in West Greenwich. Yup, plenty of mud flaps. Bought a 24x24 one for $19. I should have asked for a fully solid one as this one had some kind of pattern on it so not all pieces would be uniform thickness.
Remove chute. 4 bolts. Actually 3, but I removed all 4.
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Visually inspect impeller and clearances to get an idea about the piece you will be cutting, as well as where to drill the holes to bolt it in (watch back side of blade for interference).
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I have heard of much worse than this, but even this will decrease pumping efficiency in the slushy stuff.
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I measured and then cut out cardboard for my template. It was pretty obvious what shape and size to cut it after I inspected the impeller for a while.
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The holes would need to go toward the back to clear that support brace.
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I added some washers on the top (in some cases) to help spread the load. Probably should have made them all the same. I used an auto punch, a 1/8" bit and then the 5/16" bit. Broke my 5/16" but I had an even nicer set of bits so I didn't have to run out. The impeller metal was not particularly hard or of high quality imo. I did have to run a file underneath after drilling each hole so the washer would sit flat underneath.
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I ran mine on the tighter side so when they self-clearance it would be a nice tight fit. Turns out it was too tight...
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Now it was time to run it to break in each flap. I started the machine and let it warm up a bit. Engaged the auger, instantly stalled it. Started it up, stalled. Did this a few times. Uh oh. Then I tried slipping the belt. Smoked the belt, at least temporarily. So I basically kept trying to engage it and eventually I was able to. Like I said, it was too tight. I ran it for quite a while, even moved some snow with it. It does seem to throw farther from what little I tested so that is encouraging. But it stops almost instantly when I let go of the lever. Also it heats up the housing so hot that I can't touch it. It does cool down fast. I just made them too tight. Probably didn't account for expansion while spinning. I knew it would be too tight. I could rotate it by hand, only backwards, as you can see in one of the pics above.
Well, I guess nothing I can really do now but wait until I need to use it and keep letting it wear in. Hope I did not hurt the belt.