Does anyone have a source for the negative earth variety? I have a friend with a 1976 Triumph Spitfire, and he needs some replacement smoke but his is negative earth. I'm afraid that if we use positive earth we'll run into additional issues.
I think it is the same smoke, they just put the lid on the other end of the container - - - maybe you could just drill a hole in the bottom ?
I have always been a huge proponent of filling bus tires with helium. Just the rolling weight savings alone more than make up for the cost plus sucking the tires is great fun at parties...