Here is a pic of the parts that go to make up the Pechauer shaft joint.
The OB-1 is for a Pechauer Pro series that I did about a year ago. Notice the piloted insert. The insert on the right is for a Pechauer JP. It's meant to be installed flush/flat-faced.
The deco rings are the same for each cue except that the alum. ring goes on the Pro series and the stitch/dash goes with the JP. The blk. phenolics are the same for each cue. I stated earlier that the stitch/dash was .030" but it's actually .036". The alum. is .030".
The top blk. is .160" + .030" alum. + .280" bottom blk. Total stack: .470"
If the cue is older than what the parts I'm showing indicate, Pechauer used a stitch ring like the billet(s) in the background. I'm pretty sure it's the billet on the left. The more I look at the one on the right, the more I think I made that one for a Jacoby. Anyway, you'll know once you have the cue in hand.
Like I said, if you get stuck, just ask. I'll try to get you through it. Since you're 'new at this', I won't charge too much,LOL. Just kiddin.