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Dynafit/Ski equipment failure question

  • Joedabaker
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15 years 5 days ago #197951 by Joedabaker
Replied by Joedabaker on topic Re: Dynafit/Ski equipment failure question
Thanks Big Steve for taking the time to lay out that info.
Very informative.
From the pictures of the inserts, the outside threads look pretty deep and aggressive. Apparently not? They sure don't look like external machine thread, at least on the pictures.

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  • wooley12
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15 years 5 days ago #197954 by wooley12
Replied by wooley12 on topic Re: Dynafit/Ski equipment failure question
A suggestion. I believe the Baker Lite has a wood core. I have been repairing and relocating binding holes in XC skis for decades by drilling a 3/8 or 1/2 hole and gluing in a hardwood dowel. Never had a failure. XC bindings have only 3 screws and I tele ski them hard and often. Titebond II has been tested for it's claims that their bond is stronger than the original wood. I used this repair method to fix 2 spun screws on my Manaslu's and it's holding up fine. I coated the top of the dowel with epoxy to waterproof and epoxied the screw too. If I had your problem, that's what I would do. The dowel has to be the hardwood variety.

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  • ToddL
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15 years 5 days ago #197955 by ToddL
Replied by ToddL on topic Re: Dynafit/Ski equipment failure question
Just a follow up on inserts vs helicoil.  My point was that if hole created by the screw pulling out is larger than the bit required for a helicoil, but smaller than the bit required for an insert, I'd use an insert.  Using a helicoil in this case would mean that some of the threads would not be supported.  If either option is viable, which one is stronger would depend on a variety of factors related to the construction of the ski.

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  • ron j
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15 years 5 days ago #197957 by ron j
Replied by ron j on topic Re: Dynafit/Ski equipment failure question
Wow.
There's some great solutions here that could save buying replacement skis (not that there's anything wrong with buying replacement skis  ::))
Filling the torn out area with epoxy and then using the DynaDuke plates suggested by climberdave and then possibly even the epoxied in thread inserts suggested by Big Steve, I'd bet that one would have a bomber toepiece attachment.
Silas, are you listening :) (Silas just pulled the Dynafit toepiece off one of his Manaslu's 3 weeks ago).

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  • Big Steve
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15 years 5 days ago - 15 years 3 hours ago #197958 by Big Steve
Replied by Big Steve on topic Re: Dynafit/Ski equipment failure question
joedabaker, the pic is somewhat misleading.  QK/BF threads are 5/16"-18 TPI machine screw threads, less aggressive than ABS screws or helicoils.  It's obvious when you handle and examine them side by side.

Todd, in theory your comment about the ripout hole diameter has validity.  But ripouts never leave a truly round hole with a clean perimeter of full density core, so, IMV, a delta of 0.8mm radius is insignificant in practical application, except, maybe for a metal top sheet.  (I'll think about that; pullouts don't happen very often on skis with metal top sheets, so it's probably academic).   Also, having done some DIY non-scientific ripout tests of QK inserts and helicoils in old skis, I cannot imagine a circumstance where the QK would stronger than helicoil.  I do not have the equipment to quantify the pullout force, but on my test mounts the helicoils seemed more strongly anchored on three different test skis (two wood, one foam).  QK/BF are new to the market so time will tell.

ETA, DynaDuke or B&D plates are the alternative if you want widely-spaced screws in fresh holes.

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  • wooley12
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15 years 4 days ago - 15 years 4 days ago #197962 by wooley12
Replied by wooley12 on topic Re: Dynafit/Ski equipment failure question
With a Manaslu, the word on the web is helicoil for repair. I ran into my issue 2 years ago, before the Manaslu spinner/pullout epidemic hit.  As I always have, I worked with what had and what I knew would work. Figure that's as good as anyone else's conjecture. Wood is good. They even make skis from it with pieces glued together.

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