wind damaged tree repair
We have a 20' deciduous tree which was damaged by the wind. There are 5 trunks, one of the trunks goes up about 4', then splits into two large branches which are about 15' tall. The wind split the trunk of these two branches. Where the two branches meet there is now a split about an inch wide and 15" long. It's as if Godzilla walked up to the tree, took a branch in each hand and forced the two branches apart causing a split an inch wide where the two branches used to meet and 15 inches long right down the center of the trunk. A picture would probably help. My choices would appear to be:
1) Leave it alone;
2) Somehow try to force the two branches back together and wrap something around them keeping them together;
3) Cut the trunk off just below the split; or
4) Cut the trunk at the base.
I really hate 3) and 4) because it's a huge tree and this would cut off 20% of it. This trunk is maybe 4" diameter below the split and 6" diameter at the bottom. If I do need to cut it can I use a chainsaw or should I use a handsaw for a cleaner cut?
Sorry if this is the wrong forum, I didn't see a more appropriate forum. Any help is appreciated!!