Mitch , Take a look at this picture - it is tight but you can get a double in the space. Lots of time a and checking the 'fair lead' to make sure you have it in the right spot.( _www.MSOG.org_ (http://www.MSOG.org) - M-17 - LB/GF - middle left photo OR see attached if the list will take them.) I have since stacked an additional single sheave on top of my starboard blocks. You can always stack doubles - but I would keep the reef on the boom- it doesn't make sense to complicate the boat for a minimal change in the actual location of the line and don't forget the K.I.S.S. principle ! :<) GO. LB/GF! M-17 # 316a 'that ain't bad gelcoat -it's "patina"! Team Geezer Racing.....Old and in the Way In a message dated 3/21/2010 7:47:06 A.M. US Mountain Standard Time, mitch_carnes@sbcglobal.net writes: Has anyone run their halyards aft on their M17? I'd intended to use a pair of double pulley deck organizers to make the turn aft but am finding they fit awkwardly between the hand rails and hatch slides on the cabin roof. I'm thinking I have room for only a single cheek block on each side of the cabin roof. I had hoped to run halyards and reefing lines to the cockpit. I'm now thinking maybe I'll only run the Halyards back, and put the reefing line on the boom. Any input? I also think if I do boom mounted reefing line I might use a hook on a line turning through a cheek block to a cleat on the boom. Mitch M17 656 Grace. _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats Remember, there is no privacy on the Internet!