TravellingChick wrote:And it still won't fire

I don't think it's the starter motor as it was hot starting using a screw driver across the connections.
The above implies that there is a good enough feed and earth but the switching of the solenoid is suspect. Afterall, by shorting it this way you are just eliminating the solenoid contacts and feed to the solenoid.
The most common issue is the spade connection to the solenoid...or should I say, the last 2 - 3 inches of wire that internally corrode and blacken with age.
The common repair is to cut a couple of inches off and re-terminal (if the wire is long enough.)
I suppose the contacts in the solenoid could also be suspect but this would require a new solenoid (if they can be purchased seperately?)
I would still check all the obvious things AS WELL...earth strap on the gearbox tail end, battery terminals and braided earth strap, the battery itself....and for slow cranking, the oilite bush that supports the starter ends (housed in the bell housing and costing under £2.00)
Martin