Just buy a hacksaw?
have one do I need spacial blade? Dont have a guide .. 2 stems?
^ see, a noob!
If you're careful, with a wet rag on the floor to catch carbon resin, wear a mask, and slowly and gently cut the steerer with the old two stem solution.
A vice is greatly recommend for this (carbon blade aren't necessary if you're careful).
Carbon?
Yes: http://www.parktool.com/product/carbon-saw-blade-csb-1
@amey started
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Just buy a hacksaw?