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I have a friend who may be able to duplicate the pin, using the dimensions so kindly posted by Rothhammer. However, I need someone to explain to me how the spring catch works and how it is fastened to the pin.

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Hard to see, here, but #85 appears to be the pin without spring (notice 'slot' lengthwise, just below center) and #86 shows the shape of the 'spring'. Spring seems to be one piece machined spring steel that simply fits in the pin's hole and slot.