25mm titanium bar, drilled out..it sits in a bronze bush in the bulkhead and just runs in some steel tube which is welded into the steel work on the flipper arm.
20mm plate was way ott- but was cool. 12mm would probably do you.
the most important part is the arm, if your having an arm with a bend in it- try to design it with a tension bar going from the pivot to the tip.. otherwise the arm will try to straighten itself out when it fires without load on.. doesnt have to be much.. turbs is just some 12mm high tensile tube.
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