I haven't messed with the toe strap at all, not sure how to extend the toe strap on these bad boys.. I tried to pull the buckle on the actual toe strap (not too hard) and it wouldn't budge, kind of scared of breaking them and not sure if they where meant to be unbuckled
I had to do the same thing on my 390's. They are tough the first time but will open. Just try and be careful, just to be safe. The last thing I want is for you to rip it open and cause hell. Realistically? Chances are slim.
Crank it open. After the first time it will be easier.