I think it's out of warranty.
I had a hard time putting a kidback on my tandem because the Truvativ stoker cranks were 130 bcd. The kidback was 36t. I wanted to replace the drive side with a cheap simple 110 bcd. But every 110 bcd I found had the square taper hole clocked 45 degrees off from the Truvativ
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Genesis 49:16-17
"Well, well!" said Holmes, impatiently. "A good cyclist does not need a high road. The moor is intersected with paths and the moon is at the full."