I haven't done this for about 30 years, but thinner tubing is the way to go; I'd guess 1/4". It works very well on either of the M boats down to about a beam reach. Dave Scobie might have something to add. -----Original Message----- From: bownez@juno.com Sent: Tuesday, November 15, 2016 8:02 AM To: montgomery_boats@mailman.xmission.com Subject: M_Boats: Sheet to tiller steering Hello Listers, I plan on experimenting with self steering for the M17 this spring. I know the basic set-up, and I understand it requires a lot of testing, adjusting, positioning. etc. Todd Mills was the true expert on this, I don't know if he stills monitors the site. Anyway, I know surgical tubing is the way to go for the spring tension, but, I do not know the size to buy. Anyone played with this and can clue me as to what to order? Thanks, Mr. Bones ____________________________________________________________ How To Fix Your Fatigue (Do This Every Day) gundrymd.com http://thirdpartyoffers.juno.com/TGL3141/582b31f0b06e631f04877st03vuc -- I am using the free version of SPAMfighter. SPAMfighter has removed 17602 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len Do you have a slow PC? Try a Free scan http://www.spamfighter.com/SLOW-PCfighter?cid=sigen