Also, many thanks to Chucker as I would not have even tried this without reading his post.
Ordered a 1lb box of scrap leather form ebay. Was advertised as 4-5 oz. It measured out to 1.5 - 1.75 mm. The cup I have from OCP is 1.4 mm so pretty close.
I cut down the 3/4" copper cap with a tubing cutter.
Cut out the leather to ~1.25" in diameter and soaked in water for ~ 15 minutes.
Pressed the leather into the cup with a 1/2" piece of copper.
Let it dry overnight then trim off the excess with a razor blade.
Punched a 1/4 inch hole in the middle.
Did not have any neatsfoot oil so used some Obenaufs leather oil.
Installed on my 288 and is working well.
I bought some boots from the goodwill for the leather.
Duane, you can do this with the pump tube of whatever GPA you need a cup for, then they are just right size.
hikerduane wrote: I guess a socket or similar size would press the leather for inner diameter.
Or a ss bolt up the center, a couple washers and hex nut to form them in the copper cap. I let them dry overnight since I soak mine in water. Yes, the center hole needs to be punched out before doing this.
"...Good people pass away; the godly often die before their time. But no one seems to care or wonder why. No one seems to understand that God is protecting them from the evil days to come." Isaiah 57:1-2
Eye-SEE-C-C Member #1333 -- MilSpecOps #003
"Michigan - from the Ojibwa word “meicigama,” meaning “great water.”
it works better if you soak in a mixture of metho and water ., alcohol and water
much better punching the hole after forming the cup
light weight mineral oil works very well , even just normal engine oil .