broken heel clamp on crampon

12:23 p.m. on April 23, 2017 (EDT)
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I have a pair of 20 year old GAS (GAZ?) trekking crampons, made in West Germany, that have withstood many hard treks but the heel clamp on one of them has broken and my makeshift repairs haven't worked. I've been told that GAS crampons are  no longer made so I'm looking to buy a replacement heel clamp or a used pair of GAS crampons from which I can swap heel clamps. Any leads or hints would be appreciated. I can send photos if that will help. 

10:35 a.m. on April 27, 2017 (EDT)
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You might be able to braze it with an oxyacetylene torch.

1:06 p.m. on April 28, 2017 (EDT)
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Thanks but it's not the metal loop (the bail?) on the rear clamp that is broken, it is the rotating plastic heel holder that pushes the boot heel tight against the crampon. I have tried switching the plastic part with one from another manufacturer's crampon but apparently each is unique. I appreciate the idea.

7:40 p.m. on April 29, 2017 (EDT)
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Sorry I have only used the old style steel ones.

10:43 a.m. on May 26, 2017 (EDT)
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Losing a crampon can create a life-threatening situation.  Like climbing harnesses and hardware, I can't advise strongly enough against using gear that might fail due to wear or breakage.  

May 29, 2017
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