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Don't know why I didn't think of this years ago for setting timing on cars with vacuum advance on the distributor. Usually, I would disconnect the vacuum line and plug it with something- usually a golf tee- and reconnect it- unless I forgot- when finished. For years I have had an assortment of surgical instruments used in my real job in my tool box for delicate work on electronics or in tight quarters. It never dawned on me to just clamp off the vacuum line with a hemostat to do the timing and then remove it when done. DUH. I just have to remember it gets hot (burned fingers) if left on for any more than a couple minutes. There are lots of similar clamps available that will work just as well.
I usually just stick the hose on an exposed valve cover stud or a pin on the carb, the air filter stud, or whatever is handy...but that is a good trick if you have them. they do also actually sell a set of those for hoses, brakes/heater/vacuum, etc. I think even HF sells a cheapo set...
"because you were using them for something else". Nah- it's hard to open a drawer in my house without finding some type of stainless steel "tool". I had about a half dozen hemostats of various sizes hanging on my peg board in the garage ten feet from the car. I just never thought about clamping the line instead of removing it and plugging it.