Neil: If you are boosting from another vehicle using the idea your friend suggests, be careful nothing touches between vehicles. I was doing just that 35 years ago, and nice new steel cable attached to tractor fell on bumper of 63 Pontiac. The bang was much like a rifle shot and I had pieces of battery in a 50' radius. Luckily car was parked behind Farmall 300, and I was standing in front of tractor tire. The tire sheltered me from the acid spray. The only damage was a new battery for car and a lot of rusty hardware in surrounding area. Personally I would replace the battery cables with new 1 gauge cables with soldered on ends. You do that and with new 6 volt battery, if the W6 doesn't start at current temps, you have other things like points, condencer, rotor, cap, plugs or carb that need attention. I can see your need in getting tractor going to assist in diagnosis. Since 1939 the very best way to get a stubborn 4 cylinder gas IH going is a tow start. I have tinkered all day on these, nothing would make them start, not even 12 volts. Tow them 25 feet and they are going. I can remember a neighbor, hay and cattle farmer, had a fleet of about 6 H's, 300's, etc. When summer work was over he backed them in shed for winter. Come spring, he never even tried the starter, just hooked to them with his loader tractor that he used year around. Most of them started in shed doorway.
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