I just put the calipers on the tips they are .338 at the knocks and it takes whole lot of pressure to get them to even budge a little, pretty much 10 in. leavers so I think I will start at 10 in. & pencil scribe the sides take them down slow with sanding sticks & check for bend on the tree as I go ,should only take a pot a coffee & about 5 hrs...lol then I will smooth in from the mids and hope I lose little weight, it surprises me how much mass you can lose with glass for so little material removed