I've always found that the 6767 does a much better job with tight spaces than the 6111, especially when it comes to the 18mm spring bar at the clasp end. The reason why is the flat/wide fork of the 6111 is simply too wide for the space between the springbar and the channel in the clasp.
As for dismounting, I've always found the easiest procedure is from the top, but with a few distinct and separate steps. First, gently wedge the small fork of the 6767 in between the edges of the strap and the clasp to the point where it stays embedded. Then, add masking tape to the parts of the strap and clasp that are immediately above and below the wedged in springbar tool fork. Then, hold the strap in the palm while applying slight pressure up to the clasp, like when you're popping off a champagne cork. And finally, slowly wiggle the springbar tool fork to feel for the shoulder of the springbar, and slightly wedge it down.
Never scratched or damaged a strap or clasp using this method. Also the masking tape on top and bottom help catch the springbar if it exhibits the "pogo stick" effect after removal.
Best of luck.
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