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Old 26th March 2008, 12:47 AM   #3
Join Date: Aug 2006
Posts: 639


Regarding your situation B, you would be running a very high risk of mast failure unless you have a least 15cms (6") of the extension inserted in the mast. Any less than that doesn't provide a sufficient bearing surface and unduly point loads the mast. However, I think the minimum could be argued a bit contrasting RDMs and SDMs, since RDMs have a thicker wall structure. Still though, poster 2 offers a very good rule of thumb to follow by highlighting the length of the ferrule that joins the top and bottom sections of the mast.
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