Greg, Something sounds suspicious. I have M15 #310 and the backing bar on mine is about 2 " long to spread the weight. If yours can be rotated 90 degrees it is way too small. The backing bar on mine cannot be threaded as there would be no way to get it tight to the hull deck joint. I have never had mine off but I think the backing plate is actually round bar stock or tube stock to better match the curve of the hull/deck joint. My boat is a bit of a drive but if you would send me pictures of yours off list I will compare it to mine and send you pictures of mine. The newer boats have a slightly smaller backing plate but you cannot rotate it 90 degrees. Thanks Doug Kelch "Seas the Day" M15 #310G ________________________________ From: Patti Raymond <pattiraymond@sbcglobal.net> To: For and about Montgomery Sailboats <montgomery_boats@mailman.xmission.com> Sent: Wed, May 5, 2010 4:18:50 PM Subject: Re: M_Boats: M-15 Side-stay chain plates Thank you for the input Gila and Gary...I'm not of a mind to tap the back-bar so I think I'll just use the old bar...rotate it 90 degrees and re-drill for a thru-bolt...probably flatten the area around the nut and washer and double the nut up...there was already a nut and washer to snag my fingers on the original application so no big deal...again thank you....Greg ________________________________ From: "GILASAILR@aol.com" <GILASAILR@aol.com> To: montgomery_boats@mailman.xmission.com Sent: Tue, May 4, 2010 10:32:10 PM Subject: Re: M_Boats: M-15 Side-stay chain plates Greg - Yes and No, they need to be threaded (tapped) OR you need to have nuts on the backside of the aluminum bar stock and longer bolts with flat washers - be sure to use an anti-corrosive such as Lanocote (Forespar) on the aluminum and SS fasteners. Butter 'em up. Quality fasteners are in order. You could use SS bar stock but that would be 'fun' to drill and tap - Bronze would also work here. GO In a message dated 5/4/2010 8:50:52 P.M. US Mountain Standard Time, pattiraymond@sbcglobal.net writes: So do they need to be threaded? ________________________________ From: Gary M Hyde <gmhyde1@mac.com> To: For and about Montgomery Sailboats <montgomery_boats@mailman.xmission.com> Sent: Tue, May 4, 2010 5:19:38 PM Subject: Re: M_Boats: M-15 Side-stay chain plates So buy some round bar stock & make new ones. Sent from my iPhone :-) On May 4, 2010, at 4:45 PM, Patti Raymond <pattiraymond@sbcglobal.net> wrote:
I guess this is what you'de call them. Mine where loose so I tried tightening them and of course the 30 yr old bolt spapped like a brittle bone,,,no sweat I'll just slide the bolt out and replace....wrong...the backing bar? is aluminum, the bolts SS and the bars are threaded and the bolts are not going to come out...can I drill out the old bolts and just thru bolt back together or is the threading essential for strength...can I just toss the old backer and use a flat SS backing-plate...or are these a common item I can purchase at my daily sojourn to West Marine? Clear as mud....Greg Adams....#151 _______________________________________________ http://mailman.xmission.com/cgi-bin/mailman/listinfo/montgomery_boats
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