I don't want to be a damper (pun intended) on this but although dampers with the same resistance in both compression and extension strokes were considered adequate in 1950 only a few years later it was realised that one needed more damping on the extension than the compression stroke. If one wishes to use an original-looking Vincent damper for the look then fine but note that modern dampers like the AVO do have more damping on the extension than the compression stroke and, so far as I can tell, so do any other dampers used on modern machines. Keep it original by all means if you wish but if you want better comfort and handling then use a more modern damper.
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