Some newbie questions

I bought a used Laser from 1979 in a really good condition for 500€ some weeks ago. Currently, I'm getting used to the boat and I installed an XD upgrade kit from Holt Marine as you could hardly pull the old vang even on land, but not while sailing. Now it is very easy and fun to trim the new outhaul, cunningham and vang.

As I want to preserve that nice condition, some questions arose:

After sailing (or cleaning), there often is a lot of water in the mast hole. Until now, I always tried to...

Some newbie questions