External fiberglass couplers

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kclo4

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Does anybody know of any manufactures or vendors that sell external couplers for the common airframe tube sizes such at 38 and 54mm?
 
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Yes, it would make life easier on a interstage coupler idea I have, but I could roll my own if I had to.
 
I thought about using something like this myself a few days ago, but more for reinforcement with a standard coupler so both sides of airframe are squeezed. Double shear for any pins used? Mainly for short inner couplers / not much room inside for laundry.
 
Only tangentially related: mailing tubes seem to be measured by ID instead of OD. I've tested w/ 2" & 2.5" vs Estes PSII, makes a good external cardboard coupler.
 
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