How to do a Capillary Butt Seal #4

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After you have done this to the other capillary tube, you have two nice large inner diameters to butt seal to one another or to standard wall tube. When attaching the two tubes together, use a flame wide enough to heat both tubes, but once sealing has begun, be sure the width of your flame is narrow enough to not heat more glass (width) than necessary.

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