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 Trim and hinge (when hard)

a.     The Mylars should release easily and you are left with a oversize TE. If this is still flexible/rubbery leave the unit a bit longer as working on it like this allows you to put finger dents and dings into it.
 

b.       When it’s hard you can simply trim the TE with a sharp knife.   
  

c.      The hinge is a bit more fun. First cut the open side, trying just to cut the skin. Then do a second skin cut a couple of mm farther back (I like to mask the area and draw lines to make this a bit less hit and miss). Now check the reverse side. If you are like me the first cut was too deep and you can see a mark on the back of the hinge skin. Either way gently extend the first cut till you touch the skin hinge (Gentle pressure on the tail to open the joint will allow you to feel the knife hitting the far skin). Go gentle and take it slow and easy.
        

d.       Now the hinge side will have a mark and you can “sand” a hinge line with a straight edge and a Dremel cut off wheel. I like to use the heavy duty wheel as it is thicker and so not as easy to actually cut the cloth with. Take your time and gentle pressure. You will feel when the wheel hits Kevlar, it “sticks” as you move it along, where as it was gliding over the epoxy layer. Just hitting the Kevlar is far enough.
  

e.      Now open the Hinge right up (so that both surfaces are touching). Use a fresh blade to cut a triangle from the second cut to the hinge line.
    

f.        Finally sand the inside faces and hinge line gently.
 

g.    The hinge should now be free enough to hang down under it’s own weight.
  

The end result sitting on the scales