After foaming my 170 mast I no longer need the Hobbie Mast Float. Its in really good condtion, simple to mount. You need to buy two stainless steel bolts, two washers and two nuts. Simply remove your mast head dowel pins that hold your plastic / nylon wheels in place. add mast float using the new bolts, washers and nuts. If your interested, send me an e-mail, I can send you a picture of the mast float. I bought it used for $35.00 and will sell for the same price, plus what ever the shipping cost. glenn.basore@medtronic.com