Here I re-seal a General Motors R4 (Radial 4) Harrison / Delco-Air air conditioning compressor. It was used with R12 Freon gas from the factory. Changing to HFC refrigerant (R134A / HFC152A) means new O-rings are needed.
I purchased the seals from Gary of Mobile Mechanics. His eBay store link is as follows:
http://myworld.ebay.com/mobilemechanicsinc
*********Video of testing and charging:
https://www.youtube.com/watch?v=eadCGdwknTM