Vintage Lincoln "Lubrigun" info needed on plunger

[oldnslo]

Just picked this up this morning. Seems to be missing the plunger, and from the shape of the "keyhole" opening, it seems I could fab one up.

Anyone own one of these? I cant find a web picture of the plunger that's missing.  I'll pull mine apart later and find out whats behind the grease that's inside.

[slip knot]

I may have one. let me do some digging.

[slip knot]

Well mine seems to have a bit of coastal rash on it but maybe you can see what you need.

The rod is captive. its held in by the piston on one end and a knurled ring on the other.

[slip knot]

The piston end is held in by a rolled ring on the end of the grease tube.

Basically the end of the tube looks like it has to unscrew to get the piston and rod out. With all the rust I was leery of yanking on it to find out. If you need I can soak it for a day or so and pull it further apart.

[oldnslo]

Thanks! After closer inspection with the grease out, it seems to works in this manner:

1. It appears to work off a suction process to advance the piston.
2. The end of the piston is smooth, and there is no threading.
3. The double winged "keyhole" opening is probably meant to initially advance the piston after refilling. This double wing is to allow for a twisting action of the rode to keep the plunger from cocking to one side. When you use a straight rod to push the plunger, it tends to cock to one side and bind.

This little grease gun is a nice addition to my lube tools.