In reply to Emma Armstrong:
What size Freneys?
The problem with crampon fit is much worse in the larger sizes.
One thing I would avoid personally is any crampons that require an asymetric bar, it makes the front points pigeon toed.
For size 46 I have found the best fit is Grivel Rambo IV it also helps to stiffen up the boots, terminators are also pretty good but the front bail isn't as good out of the box and the crampon down points do tend slightly more to the inside edge of the boot also the anti bots are not nearly as nice, Sabretooths fit well also (with no need for an asym bar). I have also heard people saying the Dartwins fit but I haven't tried them.
I have found G12, G14 are not a great fit, the GSB fitting doesn't help either it actually makes the front points point more inwards than the other fittings. The front point protrusion is poor with the crampomatic fitting and the bails don't hug the boot much. Using rambo IV bails does improve this but the crampons do tend too much to the inside edge of the boot and overhang slightly here (this is without the asymetric bar which IMO just creates other problems)