Chuck - My kit resembles yours, the ether start package is mounted on the firewall and I have another bracket on the rad support to hold a spare cylinder. However, my modus operendi is what red devils dude stated. See my dash plate in the photo. Of course, the dash plate is not entirely clear in its instructions, it says "ACTUATE SWITCH DURING CRANKING". Does that mean I crank during the 3 second charge cycle AND the 6 second discharge cycle, or only during the 6 second discharge? It would seem more logical to crank only while discharging, yet the switch is clearly marked "ACTUATE", which is the 3 second charge cycle.
My local "Parts Plus" auto parts store can order the cylinders from their warehouse and it is shipped via their truck, so there is no hazmat shipping fee. The only problem is there are 4 variants of the cylinder, a 13 oz cylinder, a 16 oz cylinder, and either can be had in a 7/8" or 1" thread size. Until I get my old one off I don't know which size is correct.
Also don't know if it is factual or heresay, but I have seen posts by other members that ether start trucks develop an addiction for ether, although I have not had a problem starting my Deuce in 15F temperatures, the coldest it has been since I got it.