My fork bending jig is a 2x10 that I cut a curve on. I also ran a groove in it with a hand plane. I took a piece of metal strap, drilled a hole through it that was just the size of the fork end. Since I have some trim, I run a tap in a little, and that holds it in the strap with a bolt. The strap runs down the side of the wood, and there are several screws holding it to the wood. The more difficult issue is stopping ovalized forks from rolling, but it is doable.
If you have trim, a screw is a better way to hold back sand than a cork, there is a lot of pressure when the walls go in. I would probably tack the other end with a plate. I have trim there also. Those tacks can hold the handle on and stop rotation. The old fashioned way of bending with a cheater bar is better than a press, unless you have great tooling. The bend creeps along the blade with each degree of bend, no localization to flatten the bend.
Last edited by MassiveD; 02-05-15 at 11:30 PM.