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I'm installing Hugh's CDI system on my bobber and want to mount the regulator on the bottom cross member of the frame. See picture.
Is this hollow or solid? I want to drill and tap so I can bolt it in place. If it's solid I'll look for another place.
Every designer that is sober would use a hollow section there .
It is because the principle of equal strength sections.
But it is also lighter and simpler to work with in the shop.
If you tap on it with a hammer it might respond with a clang
I would not recommend to drill in a load carrying section like that
May I suggest clamp it with flat bars and bolts through the flat bars instead