Sheet: push it through the hole, make a 8 knot. Repeat for the other sheet. I use a 8mm salsa line for sheets.
For the two other corners I simply use a bowline with a small bit of tape to prevent the tail from slipping.
I do not have a block at the end of my pole, just a plastic plug with a hole in it, the line going from the spin through the hole and coming back out of the pole next to the snuffer.
I'm using harken 29mm carbo on top of the mast and on the beam, they haven't broken yet... The line is a 6mm dyneema core line from Marlow.