I have acquired a PV Lusso 2 group machine and I am loving it. Because I am not aware of the full history of the machine, I would like to replace the piston seals. That led me to this informative thread, and that led me to asking this question:
Would it be possible to measure and post the dimensions of the hollow alloy tube, the piece that retains the seals in place during the re-insertion phase of the process?
I am a CAD designer, and I have mocked up a version of the 'tool' used to apply the necessary load onto the spring. All that was needed for me to make that was to measure up one of my existing portafilter cups, the ears on it, and some rough measuring of the various important spots. My plan is to print this in durable ABS plastic, strong enough for the loads, and easy enough to tweak it, should it need it.
I suppose that I could order a set of new seals and take measurements from those, perhaps I'll have to wait in order to do that. But, I also thought about making a few of the drawings from my effort, so that other folks could perhaps use the data to fabricate their own tools.
There are a few more pieces of info that are missing from making this complete. The distance of how far it is from the bottom of the cup to the handle of the tool is important, as is the distance of travel of the turned screw, I want to get them both right, for ease of use when the tool is in place in the group, for hand fitting between the handle and the lower frame.
I doubt that my fabrication will be pretty, but I am with you on the functionality front. If it works, especially if only rarely needed, its not about making the thing pretty. Car jacks aren't pretty.