Like probably most of you that use the 45, the lube has a tendency to leak past the pressure nut and one ends up with a big wad of lube on top it. It's really no big deal but to me this has been an aggravation since I started using this tool 40 plus years ago. So, to fix this I decided to make a new pressure nut and use a hydraulic U-cup for a hydraulic piston, kinda like on a grease gun. I found the right size on ebay along with the somewhat bastard 3/8x20 tpi tap. Turned the nut from a piece of cold rolled stock about .020" smaller than the ID of the lube reservoir, turned a boss on the nut to allow alignment of the cup on the nut. Drilled and tapped for the feed screw. I then super glued the cup onto the nut so I could turn off the inside lip of the cup. Found, just by accident, a washer with the right diameter to fit inside the cup to retain it. Drilled and tapped 4-4x40 tpi holes, countersunk them to accept the flathead screws and VOILA, no more leaking.