Joined: Feb 2012
Posts: 19,353
Likes: 5,471
From: Rochester, NY
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Angles can shift with heat, especially in the BB shell with it's uneven mass distribution. This is one reason that some will tack the complete main triangle to "fix" the various angles and lengths at one time.
What is the filler for the DT and for the ST? Are there pins in the joint of both? To pull a pinned joint they have to be first drilled out.
At this point the "best" choice is to either start over with new ST, DT and shell or cut off the majority of the DT and grind out the rest. If you're inclined to do the first then after reordering the new stuff go back and try to bend the DT and ST back to the right angle. Either you do and continue or you screw up the tubes even more and then fall back on the best, the replacements. Andy.
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AndrewRStewart