Well, got the recovery system, purged it with Nitrogen, got a new filter for it, changed the oil on my vac pump, did a test of my scale. Then I looked at the new recovery tank I got on e-bay. No DOT specification, no pressure test date. There was neither pressure of vacuum in it. So I requested a return and ordered a Robinair tank. So we wait again.
Don't buy this:
https://www.ebay.com/itm/323857544799
In the mean time, I retook my MAC 609 test. Completely read the study guide. A very worthwhile read. The study guide is available on line for free. The test cost $20.00 to take and anyone should be able to pass the test if they read the study guide. But a lot of new interesting details were added including stuff for the new R1234 type refrigerant. Two of the more interesting things I found were how to recover 95+% of the Freon and a little mention on how much a service lines hold. They just give you a short heads up that a 6' service line can fold up to 2oz of R134. I always suspected something like that but never saw it published. That also means that my stock 107 is probably undercharged, since the required charge is 1Kg = 35.3oz and I put in 3 12oz cans and purged the line each time and then disconnected both the high and low side lines. R12 lines are not like R134a lines, they spray out Freon all over the place when you disconnect them. Its always been one of the reasons I like to charge with a 30# cylinder. But I'm not about to crack open one of my last remaining 12oz cans of R12 to put in 3 oz.
So again I weight. Hopefully the new tank will be here by Wednesday at which time I will have 3 days of 85°+ weather.