Re: I tried corn head grease!
The original "zerk" fittings in seven-tooth boxes were not intended for chassis grease. Ford dealerships had a pump that dispensed the 600w style lube into the steering box under pressure. Unfortunately, later owners and uninformed restorers thought the zerk fitting was for pumping in chassis grease - which they did, ruining the sector teeth after a short time because the chassis grease was squeezed out from between the teeth and the worm gear = no lube. Look at any used sector gear's teeth and you'll see wear gouges on their faces from lack of lubrication.
The zerk fitting in the sector housing, however, could be used for greasing the sector shaft, although the 600w (or Ford equivalent in "the Day") should have been able to work its way through the sector bushing grooves to coat the shaft. A little chassis grease pumped in here ONLY couldn't hurt, though. Just don't pump it into the gear box itself or you'll be joining the Hard Steering/Worn Sector Teeth Club in short order.
Marshall
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