Re: [SergentEng] Extended shank couplers
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The "Plus 0.130" coupler was developed with a customer's help to properly model some bulkhead flats and I presume his field work would be applicable to similar applications. Thanks to Todd Templeton for this work. Here's a picture he took of what he was trying to model. He also provided some measurements that he was able to make safely.
The "Plus 0.100" coupler is intended to be a replacement for the KD #26 style couplers. It wasn't created to match any particular prototype.
My guess is that the "Pluss 0.130" would be a better match for what you are after.