Dave,
Global Industries has these jacks for $189.00 (after a $50.00 rebate
which I hate dealing with). I work at a military maintenance shop full
time and anytime one of these come in for repair we just wash it out.
Finding the parts can be a hassle and sometimes the cost is more than
the jack is worth anyway.

You will easily have over $100 in this by the time you are done
repairing it (if it is repairable).

Here is the link to Global's site:

http://www.globalindustrial.com/gcs/...Key =30019882

If you have a Harbor Freight store nearby, I would check them out too.
That would save shipping.

Mike