If you have three hands, you don’t have any trouble using the little adapter (A in Fig.) that lets you poke the nose of your grease gun up into tight places. But if your personal T/O&E gives you only two hands, you’ll welcome the news that a new “thin-stem, rigid-type” adapter (B in Fig.) for your vehicle lubricating gun is now standard equipment in vehicle tool sets. In addition to having a longer snout than the old, the new adapter develops a couple thousand pounds pressure which the old one didn’t. Fed. Stock No. of the new Adapter, Gun, Lubricating (thin-stem, sleeve-type) hydraulic to push type is 41-A-14-800.
From Army Motors Vol 5, page 163 (September 1944.)