Hi Tamz
I too worked on asbestos without all the facts from the company and probably have all the undesirables in me and the rest is all down to luck. That said, I have a couple of friends that aren't here to tell the tale that have passed with this disease so clearly get a bit tetchy with it and angry as I wasn't told until after I'd worked on it for a few years.
I see no benefits to us engineers taking any personal risk or to customers or even our families and kids; it still makes me cringe when I think of the examples of peoples kids who died because they used to get bounced up and down on the overalls when the Dad goes home from work.
As regards when the gaskets and bolts were made, I worked and live near two estates locally which were both built in the 70's and both have warm airs, circulators, asbestos flues, rope gaskets and plastic ridge bolts; I know as I changed most of them in an exercise back in the eighties and nineties (lucky old me now!).
Sorry if I was a bit blunt, just a sore subject and cheesed off that now the knowledge is out there I would steer clear of it, just wish we had that knowledge when I started!!