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Recipe for T-Bird bar end mounts:
Ingredients: 4 washers, 2 nuts, JB Weld.
Get washers from local hardware store diameter as close as possible to the inner diameter of your handlebar. Get nut from same store, match thread to the screw that holds on the bar ends.
Now...spray mount screw with Pam spray (really, so the JB weld won't stick to it if it gets on accidently) - put screw through one washer, thread on nut, glue nut to washer with JB weld. When assembly dries, glue second washer to other side of nut, let dry. You now have a washer sandwich. NOTE: for good adhesion rough up the contact surfaces with coarse sandpaper or file. Clean with alcohol to remove all grease before applying JB Weld.
Are you with me so far? Good, now put a second coat of JB weld between the two washers. It's OK of it glops over, just file smooth after drying. You now have a bolt sandwiched and locked between two washers the same diameter as the inner handlebar
Guess what's next? That's right, using the screw in the thread as a handle, liberally apply JB weld to the inner handlebar diameter and outside of the washer/nut assembly, and insert in handlebar. Recess in around 1/2" or so. Let dry. Put a second coat around edge where washers contact the handlebar. Remove bolt, then screw handlebar ends into what is now a "blind nut" inside your handlebar.
Easier done than said - Done correctly JB Weld is plenty stong enough to take the moderate torque it takes to snug up the bar ends. I've had mine (using a Flanders Bar) on for 3 years now, no problems ever. :-D
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