913 swing weight

Started by : Titleist Fan 2179 |

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Titleist Fan 2179

I currently play the 910 d2 with 72 gram 'ahina shaft.  I switched the stock weight (red) with the lighter 2g (white).  I'd like to switch to the 913 d2 with the D+ 72 shaft.  What weight do I need to use to keep the same swing weight?  Thanks.