Well, most of the questions are answered, however, l could add a suggestion to get your butt up that mast to first, clean the track, second, to lubricate it.
One should inspect one's mast all the way up every six months, the least. (here l am talking of boats which are being sailed regularly, not mooring minders or arm chair sailors boats!!

) Otherwise, nick the corner off of a sponge from the galley, saturate it with wd40 silicon, put it above your top slider, raise the main and presto!
Going up the mast for a fit person is nothing. Any person could and should do it regularly.
I honestly do not understand the aversion of most, going up masts or to the fore-deck. It is part of your boat, why should it be any less travelled than the galley or the heads is beyond me.
Get a harness and a Jack line and go, when rough get on your knees.
Locking off parts of one's boat as 'no go area's ' is an idiotic notion of lazy people or sybarites, which notion l utterly reject. If l was physically challenged, l would not be sailing. If one gets caught out there in a blow and does not know how to thread on one's own fore deck but must, one's going to get hurt or worst.
The topping lift is like a reef, a wang, a traveller or a barber hauler, many boats got neither. I would not touch them with a sixty foot barge pole.


PS: get an auto pilot! They are independent units with fluxgate compass, only need power.
The most arduous task on a yacht ever, is helming the boat constantly.



! Yuck!