rhm pointed out that a holder for the plunger to go in the head tube could be 3d printed. So I made a solid model. It's made to conform to the ID of a 1 1/4" head tube. Maybe if you have a bike boom raleigh it will have to be shaped a little to conform to the head tube material that they found at the scrap yard. 8mm outer diameter, 6mm inner diameter. About $7.50 on shapeways. Didn't figure out how to make it publicly available. Length/diameter changes are trivial. The idea is to press or glue this into the head tube. The inner face would have to be cleaned up. I was thinking a sanding drum on a dremel.
