One of the things I've often wished I had in the workshop is oxy-propane gear, cheaper than oxy acetlyene and still good for heating and cutting. However I still can't justify paying rent on an oxy bottle I'd only use a few times a year. So when it came to cutting some steel plate I just used my jigsaw.
I then drilled some holes so I could bolt it to an old brake disc (off a car or possibly van) before sticking it in the lathe, machining the plate into a more round shape and sticking a 38mm holesaw through the middle.
I got the idea from Blackjack, you can see his in action here.