Good idea as long as the smaller one is deeper/longer than the larger one.
Rich > On Dec 20, 2013, at 22:51, sam.c.sal...@gmail.com wrote: > > You can also use 2 hole saws. One the size of the original hole ; One the > size of the new transducer. Mount them both on the same arbour (I'm told > Harbour Freight in the US sell them). You need a longer arbour to mount both > hole saws together. The smaller saw centres in the old hole, the larger cuts > your new hole. > Sam Salter > C&C 26 Liquorice > Ghost Lake Alberta > > > From: Rich Knowles > Sent: Friday, December 20, 2013 4:26 PM > To: cnc-list Cnc-List > Reply To: cnc-list@cnc-list.com > Subject: Re: Stus-List Thru hull transducer replacement > > Tapered wood emergency plugs available from chandleries make great centring > devices for the hole saw. Drive them gently into place. Mark about 1/4" from > the outside of the hull, remove, cut off the external excess, mark the > centre, replace and drill away. > > Rich > > On Dec 20, 2013, at 7:14 PM, Chuck S <cscheaf...@comcast.net> wrote: > > Replaced the old 1 1/2" speed and depth through hulls w new style 2" > thru-hulls two years back. > The newer style AirMar sleeves are much better including a spring loaded > shutoff so when you pull the speedo, less than a teaspoon of water leaks in. > Before about two cups of water would sneak in, but now I pull the speedo > after each sail because it's so easy. It makes it so easy to keep the > paddlewheel clean. > > I removed the old plastic thru-hulls and enlarged the holes using a hole saw. > Cut a wooden plug from several layers of plywood that fit the old hole and > that kept the hole saw centered. All thruhulls on Resolute are flush, the > balsa core is cut back several inches from thru-hull locations and the inner > layers are bonded to the outer layers, and the sleeve is countersunk into the > outer hull surface about 1/4". The hull laminate is about 3/4" thick along > the centerline making a fiberglass keelson. Used a dremel to chamfer the > edge and West System epoxy and 404 filler to seal the edges of glass and get > a good fit. Then 4200 the sleeves in place, snugged up the collar washers > inside, and faired over to make a racing bottom finish. The wooden plug was > the trick that made it all work. I took a few pictures if anyone is > interested? > > Chuck > Resolute > 1990 C&C 34R > Atlantic City, NJ > From: "Rich Knowles" <r...@sailpower.ca> > To: cnc-list@cnc-list.com > Sent: Friday, December 20, 2013 1:41:48 PM > Subject: Re: Stus-List In hull transducer location > > Whatever works for you. Don't let the hole size become a problem. It's not. > > Rich > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com
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