Join Date: Aug 2008
Location: Ann Arbor, MI
Bikes: '15 Kinesis Racelight 4S, '76 Motebecane Gran Jubilée
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I'm not familiar with one specifically for InStep, but you could certainly modify the mount-- and improve, I'd guess-- to work with an existing stay mount from someone like Chariot.
Most quality mounts seem to use a rubber-like tongue that's bolted into the trailer arm, and then are either pinned to the mount (e.g. Burley) or use a snap in ball end retained by a narrow collar (e.g. Chariot).
I haven't actually seen an InStep setup in the flesh, but it looks like you may be able to separate the arm from the spring, and at the other end end of the spring, separate the round tube that pins into the axle mount. If you could then place the new, flexible tongue into the tube, and then bolt those two pieces through the trailer arm, you'd be in business.
Again, I don't know if it would work that easily, but it's probably the best approach. You may be able to bolt the round tongue right into the square arm, but I was a little worried that the less-than-snug interface might allow to much wiggling and sawing that could wear at the tongue to rapidly.
Anyway take a look via Google for chainstay trailer mounts, and I'm sure there's a solution waiting. Let's us know how it goes!