Kick down linkage

If you happen to have a hardened linkage rod just buy a carbide bit. The small carbide bits don't cost that much anyway. Just be careful when you're drilling because the carbide bits are very, very hard and, therefore, brittle. Regular drill bits are also brittle but are a little softer than carbide bits. I drilled a cotter pin hole in a mopar shifter linkage and I used a regular drill bit. Just drill it carefully!!

treblig