Now the F3s are a great boot for touring because they feature a bellows similar to those found on the Terminator line of tele boots (and which were my last boots before moving to AT gear). These bellows enhance motion while in touring mode and especially while boot packing. But when downhill skiiing, the bellows compress as the sole sags slightly, thereby effectively shortening the boot. You can see the 10 mm gap under the bellows in the photo above. Hence the Dynafit shims. But the problem with the shims is that they’re unduly bulky and, being hinged, accumulate snow underfoot.
So I decided to mill my own shims from a 10 mm thick nylon cutting board. I used a keyhole drill bit to cut 38 mm diameter pucks and then drilled them to accept wood screws. Then it was simply a matter of epoxying and screwing the pucks to the ski directly under the bellowed portion of the boot. Then I carefully sanded the top surface of the pucks so they won’t interfere with lateral release.So that’s one modification made. Can’t wait to get out and see what difference they make.