Bloody clever, funny no one had thought of it before ! dual extension

Why would someone wants to leave the ext in the mast ?

See that little black elastic band on the adjustment slide thingeee ? It lasts about 6 months, before degrading. Why do companies drill holes in a part to adjust it, when it comes under bend or breaking rules ? Why add parts to create additional weight ..... on on on

What bugs me is they say set the extension to 21 to rig my sail but the extension has 20 or 22, there's no hole for 21

now have to add that one to my mast extension discussion ... (done)

joewindsurfer.blogspot.com/2013/11/windsurf-mast-bases-and-extensions.html

my question is ... what about max and min extensions ??
like extensions less than 10 cm ??
still like the idea ...

The SDM/RDM design really fits into that "why didn't someone do this before?" category...credit to the Starboard design team I say. The proof will be in the pudding but this looks like a great concept.