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Scorpion Transom Repair after Rudder accident

Just finished the repair of my transom and gudgeon mount. I found out that the rudder was somehow put in backwards and the rotation was limited when it ran aground and ripped apart my transom. In the video I forgot to mention that I ended up using woven roving to stiffen insert piece and to fill in the hole after the insert was in place. Woven roving (18oz) is much stiffer than many layers of typical fiberglass. I noticed my boat was had an inner layer of woven roving under smoother layers of fiberglass

 
Pretty darn impressive. I'm not that handy. my transom Bolts sheared.
I'm trying to figure out the easiest way to get the bolts out of the boat without wrecking the threads. I'm curious to know if you know what was on the inside of the transom if there is some kind of nut or how are there threads on the inside?
 
Just finished the repair of my transom and gudgeon mount. I found out that the rudder was somehow put in backwards and the rotation was limited when it ran aground and ripped apart my transom. In the video I forgot to mention that I ended up using woven roving to stiffen insert piece and to fill in the hole after the insert was in place. Woven roving (18oz) is much stiffer than many layers of typical fiberglass. I noticed my boat had an inner layer of woven roving under smoother layers of fiberglass
 
Pretty darn impressive. I'm not that handy. my transom Bolts sheared.
I'm trying to figure out the easiest way to get the bolts out of the boat without wrecking the threads. I'm curious to know if you know what was on the inside of the transom if there is some kind of nut or how are there threads on the inside?
On my boat the backer plate was a 1/4" or so of aluminum. The bolts are threaded into the backing plate there are no extra nuts. I would guess yours is the same if it is a scorpion from the 70's. The painful and most correct way is to drill the bolts out using progressively larger drill's. The drills need to be in the center of the bolt. Once you get close to the original size of the bolt the rest of the threads can be unscrewed or will fall out. I have never had any luck with "easy outs" They usually break off inside the bolt. The easiest option is to drill and tap a set of holes slightly offset from your existing holes in the backing plate. You can just drill through the fiberglass and aluminum and then run a trap through everything to make new holes. As you can see from my videos the aluminum backing plate is about 2" x 5" wide and about 1/4" thick, so you should be able to offset them far enough away from the original holes and still make it work. Use stainless bolts. I used marine caulk on my bolts and on my gudgeon to reduce leaks.
 
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