I had the same problem with this gun, I use a thick grease with moly, I think the spring in the tube dosent push hard enough to keep it primed in it. I took off the blue painted tube and replaced it with a silver colored one off a 12v lincoln battery gun (which i think has a stiffer spring)...
I have 4 new 3/8 drive hard handle ratchet's for sale. no markings
1 RED FHD80
1 SOLD
2 YELLOW FHD80
I'll sell the for what I got in them $110 each shipped in the US
I also have a couple 1/4 THLD72
1 SOLD
1 RED THLD72
$90 each shipped in the us
Check my ebay auction for pictures...
I do see they have a different shape base now. If it were a swivel it should be stamped 180, mine is just an 80. I would guess you have an earlier Morgan than mine. If you ever want to sell it let me know, I'm also looking for a 60 and 50.