[Towertalk] Mast Coupler?

[sparks@apk.net (sparks@apk.net)]

Greetings.  I need to get a 16ft mast down the center of a tower which is 
already standing.  I don't have a gin pole available, and it's not feasible to 
remove enough braces to get it up from the bottom.  I was thinking about two 
8ft sections of mast, which I could handle down the top or from the bottom 
without a problem.  This is a non-rotating mast, the bottom will be clamped on 
a rotator shelf with a GM MC-10 mast adapter.  I would like to use 2" alum mast.

Do they make mast couplers that would enable me to splice two sections securely?

Thanks - Jeff, WB2RUZ