The old manual that came with the '53 T100C spent a page or two detailing this nasty chore.
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Except for the bollocking you got of your mum for doing it on the kitchen stove, I didn't mind the boiling in grease bit so much, it was the cleaning it before hand that was the dirty job.
I never did it again after the 75 Triumph T140V as Japanese bikes came with an O ring chain and no split link.
Ok, confession time. I used to set my chain and Duckhams up in the back yard on top of a kerosene stove.
One day I clean forgot about it, my girlfriend cameover and we went out for lunch somewhere.
Now Duckhams was deliberately made so that it was non-flammable, but I used to extend the life of mine by adding 90 weight oil and good old fashioned "axle grease" to replace what was used up in the boiling process.
Apparently about 1/2 hour after I left the kero stove managed to heat the confection up sufficiently so that it ignited, apparently the smoke and the stench had to be experienced to be believed. My housemates decided not to approach it and simply let it burn itself out, the pity of it was that the kero tank on the stove was near full, so that took a while.
I arrived home later that evening to be told the litany of complaints from neighbours etc.
The chain was history by the time the stove burned itself out. Off I went the next day for a new Renolds chain and a new pail of Duckhams.
I did recently think of reprising the days of old and I visited a heavy equipment parts house that back in the day I used to buy chain by weight from - they looked at me oddly and roused an old block out of the back office who looked me up and down and enquired if I had bought many chains recently - he then told me that they hadn't kept industrial chain in stock for over 220 years.....