After several spoiled attempts on some practice track, I finally got my Kadee spiker to work without kinking my (Micro Engineering) code 70 or 83 rail, yet still have enough force to drive the spikes into the ties. I used up 1 and 1/2 a boxes of spikes before I found the right shim and spring loads. Now that I found the right combination, I want to pass this info on to anyone who might be considering using this tool. I’m sure it will save you lots of time and fustration!
For code 70 rail:
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Use 2 thick and 3 thin (Kadee Spiker) shims under the rubber cushion.
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Back the spring off completely, then tighten 3 1/2 turns.
For code 83:
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Use 1 thick and 2 thin shims under the rubber cushion
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Back off spring, then tighten 5 turns.