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Mizuno ST190 swing weight custom adjustment
This is a follow up on my ST180 swing weight (<---Link) thread from last year, but now having moved on to the fantastic ST190 in both the driver and TS 3-wood. Actually not much new to this since the TaylorMade weights from the '16 M2, JetSpeed (what I had dabbled with in the ST180), M4 & M6 all work, but I figured it was worth sharing. Since my driver came in at a D3 using the Atmos TS Black 6S shaft, I didn't need to touch it at all. The head is about 196g with the factory 6g weight, as an FYI.
On a good note for anyone that does happen to shorten their driver from the stock 45" link, or change shafts, the JetSpeed weight still works fine using its aluminum trim ring. I borrowed this pic from the ST190 Driver thread showing that weight installed in one (thanks to L.H. for experimenting with his!) . Same deal: slightly smaller diameter than the Mizuno weight, but works:
Stock driver head with its weight:
For me, I cut my TS 3-wood down from 43" to 42-1/2" which dropped the swing weight from the factory D3 to D0 (Atmos TS Black 7S shaft). Since I dislike lead tape, and didn't want to mess with hot melt, putting a heavier weight in was ideal. The factory "plug" is about 1 or 2g's, so I calculated that about 6g would be needed. Taking the original weight out is a cinch: put some heat on it, and use a T-25 Tamper-Proof Torx bit, or as mentioned in my ST180 thread, the TM wrench works perfectly. The bare head is about 203g:
Stock picture from Mizuno showing the "plugs" in the new fairway woods:
The JetSpeed weight, minus the trim ring is perfect since it has a diameter of about 10mm (compared to 11mm for the original). You just have to be careful that some of the heavy ones get long, so you don't want to hit the underside of the crown with them. I didn't measure how much room there is, but it's pretty decent and shouldn't be an issue for most. Here are a couple pictures of the TM & Mizuno weights side by side (Mizuno's on the left):
Once installed, you won't even know it isn't the original. Head is up to about 209g which brings the club back to D3 (matches my driver, CLK hybrid, and JPX919F long irons). The JetSpeed weight also has a thread locker on it, so that makes it even easier (just be aware that one uses a T-20 Tamper-Proof Torx bit).
Again, all the TM weights from the early M2, as well as the M4 & M6 work, (the thread pitch is 5/16-24). The head diameters are all approximately 10mm as well, so the selection is endless (especially on eBay). Some pictures for reference:
These new Mizuno woods are awesome to say the least, and tweaking them a bit should be no problem for anyone!