Originally Posted by
Bill Kapaun
They are NOT the common 8mm thread size.
As I wrote before, ask for M8 fine thread. Any company that specializes in fasteners (not a home center) will immediately know what that means. Any decent-size city will have such a company.
Originally Posted by
elcraft
Pedro's sells a specific tool to do this job of holding the BB cartridge tool snugly against the splines. The threading on the BB bolts is a finer thread than most hardware stores generally stock in their Metric bolts bins. The Pedro's version has a knurled collar that can be threaded down to meet the top of the tool. You won't need a stack of washers and you can back off the tension as the BB cartridge begins to turn and back out. Most of the time, you wouldn't need this but if the BB is rusty or has some tenacious thread sealant, then this feature is useful.
http://pedros.com/products/tools/ped...socket-holder/
Easy to make with M8 fine all thread and a matching nut, but the Pedro's is cheap enough that you don't have to. There's one now on eBay with a Buy It Now price of $9.27 shipped.