When I first started restoring vintage fountain pens, one of the first questions I had was “how does this one come apart?” Photos like the ones below helped me a lot.
In some cases, these are photos taken just as the pen came apart, before cleaning…
Parker 65 mk 3. The nib and feeder on this pen MUST NOT be unscrewed from the front. The collector (in blue) must be unscrewed using a special tool from inside the pen (see this page for more information). Rotating the nib and feeder will break a small tab that aligns the assembly in the writing unit. Note that the connector shown in this photo (the threaded brass part on the lower left) is a replacement part – not the original
Penol (and Christian Olsen)
Sheaffer Triumph Lifetime No. 1000 (See this page for dismantling instructions)