I found a complete 9224 horse car and unloading corral at a garage sale. It might have been used once; the set is complete with the instructions. There is an OTC contractor with a funny looking hairpin, maybe it is brass colored. In figure 3 of the instructions, it says to push on the hairpin. I do not understand what this does and am clueless as to what the OTC means, or what it’s function is, or how the hairpin actually pushes on the contacts. Any advice will be appreciated. This is a piece made in Mt Clemens Mich.
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