I posted a while back chronicling my experience with using the Fisher Vacuum 'machine' to form-fit my Dalbello Krypton boots that had their shells screwed up by an incompetent boot fitter. The fitter blew out the whole side of the boot, making then too wide. I thought they were ruined, but the shop owner and I did an experiment with his Fisher Vacuum machine. The results were great - the extra width was pulled in, and all of my pressure points were noticeably reduced. Done on a new boot that didn't already have packed-out liners (like mine do), it would be an absolute slam dunk - shell would get you 90% of the way there, then a day to break in the liner should yield a 'perfect' fit.
Well - that was last year, and this year I'm 'freeing my heel', so to speak. I have a new pair of Garmont Prophet telemark boots that I want to form-fit. The length, toe box, and top of foot feels pretty good, but the boot is too narrow through the heel and up the sides of my foot. It seems a perfect candidate for a heat/pressure treatment. My only concern is the bellows - they're obviously a very different material from the shell. I don't know if there are any issues or worries about damaging the bellows material with the 250-280F in the boot oven. I'm thinking of cutting a strip of metal to tape across the bellows during the pressure phase - that should alleviate any pressure related deformation problems - they just have to take the heat.
Does anyone have experience heating/punching a Telemark boot, and are there any extra issues because of the bellows section? Thanks.