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Cut a 1" piece of the 1/2" tubing to fit along the bottom of the scope as shown. The better it fits, the better glue joint. When you're happy with the fit, glue it in place. The glue a short piece of smaller diameter tubing inside the 1/4" tubing, and glue a finish washer inside.
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Fill in the hole of the 1 1/4" fender washer. Sand it smooth.
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Glue a 3/8" long piece of the 1/2" tubing on the washer as shown. (I used the end of a pencap that had a recess in it as shown...this is not necessary).
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Glue the washer assembly on the front end of the scope as shown.
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Using your favorite filler putty, fill in the cracks, crevices, etc. You may have to build-up the joint between the cone and the coupler to smooth it out. You'll also have to putty the joint between the cone and the 1/4" tubing.
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Sand everything smooth.
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