I’m trying to find the bore depth of the older Nike SQ Sumo 460 driver head?  I have one that I’m ready to install a shaft, but I’m a little worried because I’m only able to insert the new shaft to a depth of about 1-3/8″.  I also would like to use a tip weight, which makes the bore a little shallower. 
 
I’m not really familiar with Nike drivers, so any help would be greatly appreciated. This is the rounder, more traditional looking head looking version, not the big square version. Guess it’s obvious that this is my first Nike.

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