Thanks Pete I don't have a stethoscope but I use a piece of tubing. I use to tune twin SU's carbs on my MGA the same way.

The vacuum held for an hour then I opened it up because I went to bed and wanted to lock the pump up in the shop.

Now if the rain stays away this week-end. I've got two week-ends before my shoulder surgey to finish the mast and get the first lay-up on the TMS-20. Then I will be injured reserved for 1 - 2 months.