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You could use metal....a bit of brass/steel machined to fit. If it wasn't so long I'd say use a stack of shims/washers...but it'd be more than a few to make up that space.
You'd probably also run a good risk of beating some other part to death...i.e. threads for the rod/nozzle base/piston head.
I could make you one if you wanted to try that route though.
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