Hi Norm The hydraulic puller on eBay looks like it has a position for 2 legs ,meaning the puller has 4 leg positions.
The description reads Forged steel 2-way yoke allows twin or triple leg pulls.
Just mentioning this because you said you haven't seen a 2 jaw puller in hydraulic.
This other type of hydraulic puller " the Porta Power" works well and it's 10 ton.
Since I've used the large coarse bolt on the manual puller ,I haven't had a problem removing the briggs boss .
A long time ago when I could not remove the boss I would cut a slot on one side usually where the square keyway is on the shaft then hit a screw driver or chisel into the cut on the boss and the boss would tap off easily with a hammer.
