I have a Sears 16" chainsaw (a Poulan clone), that has a cute little
plastic doodad that's supposed to make it easy to tighten or remove the
chain without tools (you grab the hinged thing which swings out, then
you tighten or loosen it by hand). It worked well for a while, but now
apparently it's stripped out, and no longer turns the bolt that
actually holds the bar on.

Is anyone familiar with this, and know of a way to get past it? There
doesn't appear to be any way to get in there with a tool of any kind -
no exposed screw or bolt heads that I can see. Took it to my local Ace
Hardware (where I usually get the chain sharpened), and they were
baffled. I hate to even try taking it to Sears - they'll likely charge
me a ton to repair it, and the saw only cost $150 to begin with. It's
a good saw, otherwise - perfect for the light usage I give it.