[What's Your Favorite Iron Shaft?]

$-taper. 
have played them in a few different heads. Went back to c-taper lite and modus 120 briefly.  But keep coming back to $-taper. Just so stable. Meets my swing exactly where it needs to be for weight and dispersion. So reliable. 

[What Have You Built Recently?]

Success and failure - new to this. 
 

success: put a TM mini driver in a Tensei blue five wood shaft. Thing is a rocket launcher for me. Use it off the tee and fairway. Has replaced my driver and three wood. 
 

failure:

in an attempt to replicate this magic, tried to put a titleist driver adapter on a 3 wood shaft using only a heat gun and pliers (amateur hour). Ruined 3 shafts in the process. 
expensive mistake.