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Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
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Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
It's an optional mount point, if you find it's not stable enough.
Best thing is to fit it first and see if it needs securing more. Some do, some don't. If it does need it, drill and tap the swing arm and use a suitable bolt.