At least on inserts, part of the reason that's done is to ensure that you're not effectively changing the length of the spolettes. That would help keep timings tighter.
What I like to do is what TR does. Before ramming, a piece of masking tape is stuck over the end of the tube to close it off. The spolette is rammmed, and the tape is immediately removed. This leaves a nice rough, flat surface on the end of the spolette.
The spolette is then drilled back and the rough end is protected with a vinyl caplug until ready for priming.
To prime such a spolette, I just tie match over the rough end with some strong waxed linen string. That's all there is to it. Works for me, and it works for Tom, so I'll be sticking with it. Very precision timing with no secondary operations or drying time involved.
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