Just for those folks that have the original 60-650 or even the replacement 60-1650 door locks, use a small fridge magnet and if it sticks to the main lock plunger (not the deadbolt part) you have steel; if it does not stick you have the zinc (breakable) plunger. The two strike pins are steel its the door plunger that you need to test. The Trimark steel plunger version is one specific part number.....I think it is Trimark #29412-09.
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