Espresso machine lever was rough... I have taken it apart several times to polish the main lever cam shaft... replaced all valves... and it would be smooth for a few shots and get rough again...
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Well, today I decided to figure out what the problem was. Turns out it was a simple fix. This stud, that the lever rides against, had some raised areas around the slot for the screwdriver... seems the previous owner was not careful when installing.
Removed it, filed down the raised areas... placed it on the lathe and use some fine sandpaper to smooth it out. Finished with a 3000 grit then to the polishing wheel... Also took the time to polished the lever cam shaft again...
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All working fine now... I will be able to confirm if I found the culprit if it continues to work smoothly for the rest of the week...
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