Oh I'm with ya, my Vela's NEVER leave the house .. and here is a cut and paste from my review about adjusting the fire pin in the Caravela ..
The dual adjustable copper positive contact pin can be adjusted one of two ways. The upper portion of the pin adjusts (with pliers to initially loosen, and back out the upper pin, after that you can adjust it with your fingers) for flush mounting of your top device. The lower portion of the pin is used to adjust for battery rattle with flat top batteries. Using flat top batteries with this mod will make for the easiest, and smallest amount of adjusting.
However, in the case of nipple top batteries, you will need to remove the entire lower portion of the pin in order to close up your tubes. This will initially result in battery rattle, so you will need to further adjust the upper portion of the pin (unscrew outward), as well as adjusting the 510 connection of your top device (also outward to make contact) in order to reduce the battery rattle once the lower pin is removed. This will stop battle rattle with normal use of the mod (picking up, setting down) however, if you shake the mod around, you will hear the battery move a little …. So don’t do that.
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Thanks a bunch. Got it flush mounted by screwing in the 510 contact on the TGT slightly.