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Muppetteer
dave4
a) Bin them or make them into a clock or something :)
b) If you want carbon UT, then Centaur and Chorus are the same crank. Having said that, demand for Centaur is quite high, so you won't pay much of a premium for Chorus. Record are lighter, being hollow.
c) To install UT you just need Loctite 222 and a long 10mm Allen key as above. The cup tool is only needed to remove the cups: if you use Loctite then the cups can be screwed in handtight.
The bolt to join the cranks needs to be torqued to 42Nm, but I have found that using the long Allen key and doing it up as tight as I can manage, gives me 42Nm: I've checked this with a torque wrench.
Obviously that depends on how strong you are: you could try it and get your LBS to check it the first time.
As with all external BB, you should get the BB shell faced. Might as well get the threads chased at the same time.
d) I have a spare Pedros 10mm key and the cup tool pictured above (brand new) going spare: PM me if you would like to buy them.