I recently purchased a cheap, tired and beat HP8656A for a project, which it was. Sold as 'parts or repair only', it not only needed repairs but was missing a lot of internal hardware and some parts. I have it all working now (all with parts purchased at 4 different hardware vendors--grommets, ball bearings, screws, locknuts and washers) but I'm mystified by the fan. The old one was louder than my kitchen blender, so I replaced it with a slightly less deafening one that is functionally identical. The problems are that there is only one way to put it in and the way it is (and was) makes the fan blow IN not OUT, which seems odd. As I was sort of looking it over to see if that seemed reasonable, I realize that while there are internal holes, there is no way for air to escape or enter the case, so the fan can't move any air in either direction. The fan housing seems to only have the function of resonating and amplifying the fan noise. I do have a bit of air coming out the holes where the feet are missing, but those would normally be sealed up. So how does this work and should it blow in or out?
Also, what gives with parts availability on these? Is nobody parting out these no matter how broken they are? Or are they getting ground up for the gold? I'd like to find a handle strap, side covers, feet and maybe some key switches, but those are all either unobtanium or priced like gold ($50 for each plastic switch....).