Halyard swivel and axle pin sheave removal

[Vladis]

Hello,

I would like to ask 2 questions related to the servicing of
my in-mast furling. I reconditioned the worm drum on the
lower part of the system without major problems and when
inspecting the halyard swivel through the aperture in the
mast it looks that something is missing in a hole on the
body of the part (see picture). Is that normal?

My second problem is how I can replace the sheave on the
boom that leads the out-haul line. There is an axle pin that
I need to remove. I was told to use heat and a punch.
However I do not know from which side I should use the
hammer. The pin looks different from the 2 sides as shown
in the picture.

Thanks for any feedback, Vladis