I don’t even know if a secondary clutch is a thing, but I recently got 2 older Tombow pencils that are experiencing the same problem.
(I was able to fix one of them, but the other is being stubborn.)
Problem goes like this:
-
Clicking to advance the lead pushes lead out, but then the lead immediately retracts the exact same amount (so no lead is actually advanced).
-
If I use a piece of lead short enough, the lead advance works. Once the lead is long enough, it hits something up inside the clutch that’s really grabbing it and not letting go
-
How can I clean up or de-gunk whatever is up inside the clutch that’s grabbing the lead? Is there a secondary clutch in there? I’ve not encountered this before and am not sure what to do to fix the issue.