Club Fitting/swing weights

[Bulgarino]

I was just fitted for all my clubs and what I noticed is that the swing weight of the new irons are at a D5.  I currently play irons with S-85g shafts (stock) D1, Fitter has me at S-120g shaft and D5 custom built. 

So my question is this:

 How does the Fitter make this SW change?  I have read articles that make up SW and get it but still doesn't say how to get to D5.  Even with shaft at 120 and grip and head weights; it still doesn't equal to D5. Is there something I am missing?

[Single Length Irons Guy]

On 3/16/2017 at 5:02 PM, Bulgarino said:

I was just fitted for all my clubs and what I noticed is that the swing weight of the new irons are at a D5.  I currently play irons with S-85g shafts (stock) D1, Fitter has me at S-120g shaft and D5 custom built. 

So my question is this:

 How does the Fitter make this SW change?  I have read articles that make up SW and get it but still doesn't say how to get to D5.  Even with shaft at 120 and grip and head weights; it still doesn't equal to D5. Is there something I am missing?

You could try using a swing weight calculator to see if you get D5 or something less:

https://www.valuegolf.com/golf-club-swingweight-calculator/

[WUTiger]

A clubsmith can do a final tweak with a tip weight inserted into the shaft before it is installed. +2 grams in the tip would raise the swingweight 1 point.

That said, tip weighting technically changes the balance point of the club a bit, since the weight is added above the hosel rather than in the clubhead. Adding 2 grams wouldn't influence balance much, but adding 6 or 8 grams might. A veteran clubsmith could advise you better on tipweighting a specific amount.

Edited March 20, 2017 by WUTiger
to clarify "above the hosel" factor

[1badbadger]

Did the club fitter specifically want the irons to be D5, or is that what they happened to weigh once they were built?

The increase in shaft weight will bump up the swingweight noticeably.  That's a 35g difference between the old shafts and the new ones.  9 grams of shaft weight = about 1 swingweight point, so 35g will add over 3.5 points.  

If the new irons are slightly longer, that will make the swingweight heavier also.  The grips might be lighter, the new heads might weigh more, or the shafts might be a little tip-heavy, all which will increase the swingweight without any extra manipulation.