Felled quite a number of trees against the lean. Light trees I will under cut, back cut, then push over with a skid steer. For heavy trees I use a 250’ long 3/8” brace wire cable and put either a tractor or a payloader on it to pull. I do the under cut, then start the back cut. If the tree leans bad it is necessary to apply some pull to the tree to keep the back cut open. I spend considerable time getting the hinge just right as everything depends on the hinge holding while the tree rocks over center. Once the hinge is thin enough (and I leave them thicker for trees I pull) I have the pulling operator gently apply pull. Trees have considerable weight and it takes time to get it moving. Last leaners I pulled were green ash and I could get an attachment point in place using an extension ladder. 10 years ago we had a number of 80’ tall cotton woods to pull and I used a fishing rod with a golf ball on the line to get a line over a suitable pulling point. The golf ball would pull the fishing line to the ground, once I could reach the golf ball I would attach 350 lb knot strength baler twine to the golf ball and pull it over, then attach a chain and cable to the twine and pull that up the tree in a choker configuration. I could do the whole works from the ground. Some of those cottonwood trees had a 48” trunk where I felled them. I am leary of using wedges or jacks to try to push the tree over against the lean. Both methods can reverse the load on the hinge from compressive to a tensile load. If the tensile load causes the hinge to snap before the tree starts to move in the correct direction the tree will fall the wrong way. Pulling offers far more leverage on the mass and it completely avoids the risk of subjecting the hinge to a tensile load before the tree begins to move.
A fiasco that didn't work is all I could say. Not my proudest effort. Felling wedges and hydraulic jack had no effect and trying on another windy day was not smart on my part. Finally talked to the neighbor after trying in vain and a signed FHC waiver form did the trick. A few quick cuts and over it went...the other way. No harm done other than an embarrassing stump that would win worst of the year in MikeInMa's ugly stump thread. No pics of such to save me the embarrassment. Cleaned up all the brush and bucked everything except what the 462 will finish....over 12" wood. Fallen tree pics to follow shortly. Ill have to do a little raking in the neighbors yard. Here's the link to the waiver to those not familiar with it. I've used it a few times. Liability Wavier 2014-08-18