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Old 03-19-21, 09:31 PM
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
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I am not sure I understand what a plug-in dropout is. Internal lug? Plate style was second to squishing the blade or stays and cutting a slot for the axles. I may not know of some older lugged or plug dropouts, but I think any variant to plate or squished came much later and contemporaneously with each other with the advent of investment cast bike frame parts.
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