(We had this in our legacy archive; it is now converted to a blog post. Applies to nearly all model Dynafits: TLT, Comfort, Vertical, FT, ST, Radical)
This project is not as tricky as rebuilding a vintage automobile carburetor, but similar attention to detail will yield good results. Taking apart a Dynafit heel unit is easiest if the binding is mounted on a ski. Good mechanical skills are required, as well as proper tools. Reasons for doing this could be: 1.) repair swapping broken part, 2.) cleaning and lubrication after several years of heavy use, 3.) cleaning after exposure to road salt or a solvent spill.
Addendum: Note that later “Vertical” series bindings similar to the one pictured above have a tiny metal roll pin attaching the upper heel-lifter-top-plate plastic unit to the lower housing. To remove, push (or carefully “drive”) the roll pin inwards with a pin punch or reversed drill bit. Before re-assembly, entirely remove the roll pin, re-insert as the last step in assembly.
Our victim in these photos is primarily an 07/08 Dynafit Vertical ST. Most Dynafit bindings from the last decade or so have similar or in many cases identical internals, so these instructions will work for most models in use (main exception as of 2014 would be the Beast models).
Assembly of Upper Heel Unit
In the case of high mileage bindings, consider re-inserting the screws with a small amount of one-hour plastic-enabled epoxy smeared on the threads and under the head — to help prevent loosening or shearing due to micro movement and metal fatigue. Warning: the four screws holding the Dynafit top plate are sensitive to stripping as they’re inserted in plastic; tighten with care, and re-check tightness periodically. Do not over tighten!
To remove lower housing and side/lateral release mechanism please refer to our Dynafit brake installation instructions.
Remember, taking apart the upper part of a Dynafit tech binding rear unit is most often unnecessary and may even void your warranty. But the process might be necessary to maintain or rebuild older bindings hence our publishing these instructions.