cdrake39 wrote:Thanks ...
cdrake39 wrote:... recommend adding some food safe lubricant ...
In my opinion, a lubricant will help whatever
there, be it coffee dust or metal.
Using fine teflon tape does not have that drawback.
cdrake39 wrote:... removed the 4 springs under the carrier last night and there was significantly less resistance when threading ...
The springs act on a set of plungers that are needed to keep the carrier on axis.
They are separated 90° from each other and push the carrier up evenly.
The resistance you mention is a logical consequence of the plunger's action, that's exactly what they are there for.
Teflon tape will reduce the resistance in the threads significantly and also avoid the metal to metal contact that is generating the residue you found.
This has probably happened because threre have been very few full threading/unthreading operations and very little cleaning up since it was purchased.
Eventually, with enough threading/unthreading operations ie: when all the inner/outer thread surfaces mate, there will be no more metal residue.
Bear in mind that in standard use, there are no
full threading/unthreading operations to speak of (save for cleaning the grind chamber) as all adjutments you would be making for espresso (once dialled in) will be +/- 10 or 15 degrees max. ie: 1/24th of a full turn.Don't try
to force this process by repeatedly threading/unthreading the upper carrier: it's unneeded and you run the risk of seizure.