Like Rick said - if you can get Larry involved you will have it behind you
. Oh yea - since he works for DC he should be able to get parts AT COST. Anyway, stick with the r12. Look at ebay - 30# containers are going for close to $300 which is, in my opinion, a good price. These cars were designed for r12 and that is what they work best with. Get your on-line certs and pick up a 30# container or r12 and you are set for a VERY long time.