Cracked mast at base

[captainEd]

Any advice on fixing a crack at base? see pics... would mast have to come down?

Weld and splice a new section? Just weld? Weld and place collar around crack section?

Thanks

[model 10]

It looks like it has always been ready to crack. What kind of repair is going on there anyway? It kinda looks like it needs to taken out and fixed right.

[steamgoat]

Looks like it filled with water and froze,probably best to remove it to fix iy properly.

[captainEd]

Initial weld occurred when boom vang bolts broke... not sure why it was down like that...