Hi!
1. Instructions and mechanism? The mode and method of function is the same (as in, how you operate them for filling the pen). Differences? M1XX to M7XX filling mechanisms are friction fit and made of plastic. Those can not be taken apart without risking permanent damage/destruction. With the M8XX-M1XXX pens the filling mechanism is in part made out of brass (the housing itself) and the housing is threaded into the barrel. So, those filling mechanisms can be removed from the barrel just by screwing them out counterclockwise.
2. Yes, that applies to all modern (M-series) pens. Vintage ones? M&K are the exceptions but yeah, let's forget those for now.
3. No. Lubricate when needed (i.e. when the piston starts feeling sticky) by cleaning the pen thoroughly, then unscrewing the nib unit and swabbing some silicon grease to the inside of the barrel with a Q-tip/cotton swab through that aperture/opening. You do not need much silicone grease btw. Just enough to make the piston move up and down smoothly (so experiment with little and add more if needed).
And yes... Carpe Diem, indeed!
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