No offense, but does anyone actually read what gets posted to the forum?
Calfee's cranks are made by Martec International (of Taiwan) as mentioned earlier in this thread.
The only Campy component I called into question for use on OUR tandem was Campy's first generation CARBON cranks with square tapers that were only available as doubles... not triples. As noted in the earlier post to this thread that also ID'd Calfee's cranks as being produced by Martek,
"I contemplated making up a set of Campy Chorus carbon cranks for our tandem until it dawned on me that we'd seriously be exceeding their max weight limit as a double crankset, never mind being modified to accept a 32t granny which would have put some serious hurt on the carbon spiders."
The only point I was trying to drive home with regard to adapting components for tandems was to "check the specs" and consider the implications of your intended use of components that may or may not have been designed with the weight and forces generated by a tandem team in mind.
As for those Campy weight limits, I've not been able to purge their existence from my memory and for those who missed it, there was a point in time when Campy made a bigger deal about weight limits and it was a hot topic that even made an appearance in places like
Lennard Zinn's column in VeloNews back in '03:
Campy weight limits?
Dear Lennard,
I was just wondering if the 75kg weight limit posted on the Campagnolo Web site means all their components are designed for someone under 75kg?
--Cindy
Answer from Campagnolo:
Dear Cindy,
First of all, the indicated weight in our instruction sheets is 82kg/ 180 lbs. There is no clear dividing line defining when someone is "too heavy" for Campagnolo products. Many factors need to be considered.
Campagnolo products were designed for "racing" type bicycles used on smooth asphalt roads or tracks. Any other use of Campagnolo products is improper.
Magnified stresses and loads caused by a "heavy" rider, coupled with forces from an uneven road surface, greatly shorten the lifespan of Campagnolo products, especially if your bicycle is equipped with tires, wheels, or stiff frames that are poor at absorbing shocks and vibrations.
The weight of the rider, type of bike and the style and conditions of use are all critical factors affecting the lifespan of your product.
Technical knowledge, experience, common sense, and prudence are required. If you weigh 80 kg or more, you must be especially vigilant and have your bicycle inspected regularly for any evidence of cracks, deformation, or other signs of fatigue or stress. Check with your mechanic to discuss whether the components you selected are suitable for your use, and to determine the frequency of inspections.
--Joseba Arizaga
Campagnolo Italy
Joseba's above response was embedded as part of an FAQ on Campy's web site for several years and is now part of the 'fine print' in the instructions shipped with each Campy part.
Again, I don't care what anyone uses on their tandems unless it was something I recommended. The latter will always err on the conservative side of the equation with an eye towards reliability and long-term durability unless stated otherwise.