flushcut
Addicted to ArboristSite
Using a bottle jack works, but the floor jack has a much larger top plate so it doesn't just sink into the wood. Also you don't have to cut as big a slot in the tree to insert it, mine is a low profile aluminum "racing" jack, so it's actually quite light to carry around.
That's why you make a top plate for a bottle jack so it doesn't sink in the wood.