Ryland: Honda used to be somewhat decent about using a "parts bin" approach to engineering- if they already had a suitable part on the shelf from something else, they'd use it. Yeah. Parts commonality = good for simplicity and customers.
Now it seems they completely re-engineer the entire machine every year so that not even the bolts interchange. Special parts = profit for them.
You are right about the function of the square O-ring.
Testdrive: Cool, I'd completely forgotten about splicing O-rings! But... I won't be doing that on my square caliper seals. I'd be OK with it for the dust seals. In fact, I'm not particularly impressed with the effectiveness of the design of the original dust seals (ribbed). If the ones I have were in any worse condition I'd stick regular round O-rings in there and I bet they'd work just fine.
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