All, I am feel fortunate to have purchased an M-10 in absolutely pristine condition that had been formerly on an inland lake in Wisconsin. It sails like a dream and I am pleased it reminds me so much of the Zuma I had a while back as far as being quick and responsive. The center board and rudder have been replaced and to my feel the rudder did not have the amount of control I was expecting. I could not get a feel for what the original dimensions might have been from the photos on the mboats photo site. I looked at Kieth Harris' refit of the M-12 and noticed that the rudder looks like a scaled version of the M-17. Would it be appropriate to try this approach for the M-10 as well? I appreciate any thoughts. Robbin M-10 Tonka Too M-17 Miss Take