Disclaimer: This is not for the faint of heart. If you have never customized anything before, I would seriously reconsider.
On that note, I hope this helps. It may seem VERY unnecessary for some, but the gap drove me crazy, personally.
The traps, pecks, and back were shaved down with a Dremel. But if you don't have one, you can use a hobby knife to cut the skin away since it's a soft vinyl over a hard plastic frame.
There is a way to close the gap on the gauntlet but that is very unnecessary and will hinder articulation.
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How much did you shave off or just gotta eyeball it? Also can I see more shots of the shaved off sections please.