John,
These is the sort of thing I am suggesting. The 5-600 amp ones are better.
http://www.migtigarc.co.uk/ARC_Consumables/1083_Earth_Clamp_Croc_200amp.jpg
 http://cgi.ebay.com.au/WELDING-EARTH-CLAMP-500-AMP-/400134078812
You will see on the ebay one that it has a section of earth strap connecting both sides of the jaw. this stops the clamp from getting so hot.
Bet you can get them cheaper locally to you.
These pics are much clearer than my bad attempts at digital photography !!
The one on the left in the attached pic is better than the one on the right as it has a brass connection bolt.
You need to tie the cable to the handle so that it doesnt flex on the connection & fail in time.
I suspect you could make a set for under $100, Every time you help some one, offer to sell them for $250.
Just a thought.
Hope that helps!!
Good Luck !!
__________________
Grumpy Old Diesel Owners Club group
I no longer question authority, I annoy authority. More effect, less effort....
1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles 
1987 250td 160k miles English import 
2001 jeep turbo diesel 130k miles 
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving
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