I just acquired an old, belt driven Craftsman Joiner and tried using it
for the first time. To my dismay, it cuts the board thicker on one end
than the other. When I eyeball it, I can see that the infeed table
slants downward away from the fence.

I turned it over to look for easy adjustments, but it looks pretty
complex. Has anyone had any experience with this problem? Can it be
fixed or is it even worth it? I have $75 into the joiner at this
point.... should I abandon it and buy a new one or is this something I
will ned to learn to do to maintain any joiner?

Thanks in advance for any help/advice!

John