This issue of fin screws is a tough one to solve as 1/4-20 US thread is far
easier to find in the USA and less expensive than hard to find 6mm metric.
Most boards are made overseas, which means fins will be in 6mm like the rest of
We use 6mm in Powerbox and in Trimm. For Tuttle we use 1/4-20 so you can always
find what you like. Also we use Phillps head on all metric and stright thread
on all US. That way we can see at a glance which is which.
The solution I endorse if your Tuttle (keep PB and TM metric) fin is metric is
throw out the screws and retap to US 1/4 -20. Keep a fully assembled (color
coded, marked clearly) tap of both types in your gear bag. It is also great for
rethreading stripped barrel nuts,
The below was well put in the other string on this question:
Date: 3/25/01 3:47 PM Pacific Standard Time
Get a 1/4 20 tap or whatever is the most common SST fastener size
available to you and retap your fins' barrel nuts. The difference in
purchase the tap. This works for both Tuttle and Power Box based fins.
Thanks to Tinho at Calema Windsurfing.
Gorge Sport USA
Curtis Performance Fins, Orca Fins, Orca Kite Fins
Hood River, OR USA
ph/541 387 2649 fax/541 386 1715