As I periodically say, and resisted the last time it was relevant on pedal removal, be very judicious heating aluminium parts. 7000 series aluminium (and I think that means parts that are "ergal") can lose temper when heated to 300 degrees F or more. This is a time and temperature relationship. It takes hours at 300 and minutes at 400 degrees. The same is true for 6000 series aluminum but the temperatures run a bit higher. Reducing the temper of your parts from T6 to T0 is not a good idea.
Joe
At 04:20 PM 1/9/01 EST, Jmschaer@aol.com wrote:
>In a message dated 1/9/01 10:21:17 AM Eastern Standard Time,
>hayesbikes@nls.net writes:
>
>> I have a chainring bolt, campagnolo, that I have so far be unable to get
>> off the crank. It is holding (the remaining one) two NR chainrings
mounted
>
>HEAT!!! Let thermal expansion do the work for you. Better than brute force.
>Either half of the bolt could strip out, and skin could be lost.
>
>A hair dryer might do, but an industrial heat gun is much hotter. One of
>these has so many uses for bikes, cars, and home; really worth the money.
The
>"flame wrench" isn't always practical for small, more fragile parts. Many
>hardware stores have something - probably $20-40.
>
>Jon Schaer