Mon Jan 11, 2021 11:06 pm
You should know that there was a recall on those that added a brass retainer over the HP seat to keep seat from moving out of position. That could restrict or block airflow. Yours may already have it, but I can send more information if you need it, and have the single part available if you need it.
Just an aside... that regulator listed for $153.50 in 1976 price list. That's about $700 in today's prices. Still a good regulator, and just about anything you need for rebuilding and maintenance is available.
The older I get the better I was.