So OK ... every 25 years or so I change out the Halyard Box. I'm just a few years late on that schedule, but thought I would share:
1. I didn't do the work but had John at Rose Marco Marine do it. He's the service manager and normally wouldn't be out in 90+ degrees and sun, but things are slow this time of year.
2. We did pull the mast as we had other things to do.
a. new VHF antenna -- every 7 years even though it is now working fine. four years of sun is cracking the case top. I don't remember when I did the coax, but the plugs are green.
b. new main sheave -- every 25 years [and grooved from wires used in past].
c. new Second Spin Halyard ... just because why not. There are now two J30s with second spin halyard run.
d. new second jib halyard ... every 10 years and because I stupidly kept wire 10 years ago when I redid it.
e. new harken roller furling and headstay, which was new on #327 in 1982 and moved to #505 in 85. Yes, I have had that same headstay/Harken for 30 years. duh .... the reason we had to change it is that the way they were built then there is no easy way to really inspect the forestay.
f. new spreader boots ... they only last 4 years here in the sun.
3. Here are the photos of the insides of the box replaced:

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Note on work ...
it basically took about 5 hits using an inpact driver to break each of the 12 machine screws free. minor scaring, but reused. Also the screw holes in the replacement halyard box were slightly off center requiring some filing to elongate them up say 1/32 of an inch or so. no big deal ... I would have used a dremel, but John is an old fashioned kind of guy and rattail filed them to fit.