Thanks, Jussi.  I’ve always thought that once you drill all the properly aligned holes and put the bolt through, you have created a potential weakness which can be exploited by rotation stress enlarging the holes.  There were several stories about bolts shearing from this effect, and you actually had a mast failure!

73,
Dennis/RZ

On Sat, Sep 7, 2024 at 9:02 PM Jussi Eloranta <eloranta@aa6kj.hopto.org> wrote:
Well, my experience with pinning is a failing mast pipe. It started developing a fracture that slowly progressed and the pipe finally snapped, bringing down the antenna!

My current gear is pretty lightweight, so if the alignment gets out of whack, I will just fix it (rotate). No more pinning for me but all that depends how easily it can be fixed...

Jussi (AA6KJ)
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