I broke the diaphragm screw on my La Peppina during disassembly. I contacted Orphan Espresso. It is an unobtanium part. I thought I would share my solution.

The first order of business was to remove the broken stub of the screw. I removed the top threaded shaft and drilled through the stub. I used pointed taps as reamers with a 6mm to finish. It cleaned it out and I didn't have to go oversized.

The shoulder on the machine screw is part of the design to keep the screw from crushing the diaphragm when it is tightened. So a regular machine screw wouldn't work propperly.

I couldn't find a shoulder screw that would work after searching online and at my favorite "if-they-don't-have-it-no-one-does" hardware store. I did find a ¼ inch x 1-1/2 or 2 inch stainless steel socket cap screws. They are partially unthreaded and the right unthreaded diameter. I ran a 7mm x 1.0 die down the screw, leaving 2mm uncut. I followed it with a 6mm x 1.0 and then flipped the die around for a more squared cut. Now I just need to cut it down to 9mm under the head (thanks Doug for the dimensions). The cap head screw also fits into the hole in the piston without modification. It is now a 3/16 Allen socket but that is unimportant.



If you know of a source for the shoulder screws, a post would be appreciated. Thanks.

Mine doesn't have a shoulder screw, just a normal bolt.
That's maybe why i found it hard to adjust. But it works fine now, i used plumbers tape on the threads and did'nt tighten the screw all the way, just until the diaphragm sits tight, but without compressing it.