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.355 or .370?


Robert L.

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I'm considering reshafting my 1963 Haig Ultra irons. It would be with a steel shaft like a regular flex Dynamic Gold shaft, or something along those lines. It would give me an interesting winter project. However, I do need to know if these irons are .355 tapered bore, or .370 parallel bore. I'm thinking .355, but I'd like some of you experts out there to confirm this.

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I think parallel bore came in the 80s.  Definitely not before the 70s.

Driver:  TaylorMade 300 Mini 11.5° (10.2°), Fujikura Ventus Blue 5S Velocore

3W:  TaylorMade M4 15°, Graphite Design Tour AD DI 7S

Hybrid:  TaylorMade Sim2 2 Iron Hybrid 17°, Mitsubishi Tensai AV Raw Blue 80 stiff

Irons:  Mizuno Pro 223 4-PW, Nippon Modus3 Tour 120 stiff

GW / SW: Mizuno T-22, 52° (bent to 50°)/ 56° (bent to 54°), True Temper S400

LW:  Scratch Golf 1018 forged 58° DS, Nippon Modus3 Tour 120 stiff

Putter:  Byron Morgan Epic Day custom, Salty MidPlus cork grip

Grips:  BestGrips Augusta Microperf leather slip on

 

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2 hours ago, Robert L. said:

I'm considering reshafting my 1963 Haig Ultra irons. It would be with a steel shaft like a regular flex Dynamic Gold shaft, or something along those lines. It would give me an interesting winter project. However, I do need to know if these irons are .355 tapered bore, or .370 parallel bore. I'm thinking .355, but I'd like some of you experts out there to confirm this.

They may be neither one.  Many of the Wilson bore through irons (Haig Ultras were a Wilson product) had taper tip shafts of a smaller size than .355.  They had to be bored to accept a .355.

 

Truth is, I'd leave them alone.  I have never believed there were huge performance differences between steel shafts of similar flexes.  If you were trying to go from a stiff to an A or L flex it might be a different story.  Wilson irons are notoriously difficult to unshaft as well.

 

I don't know the exact year parallel tip shafts became available, but they were certainly around in the mid 1970s.  The Browning products that came out in 1976 had them.    

"You think we play the same stuff you do?"

                                             --Rory McIlroy 

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13 hours ago, Shallowface said:

They may be neither one.  Many of the Wilson bore through irons (Haig Ultras were a Wilson product) had taper tip shafts of a smaller size than .355.  They had to be bored to accept a .355.

 

Exactly.  I think it was the earlier Firestick shafts that had a .342 tip.  I've also encountered a smaller-than-.355 bore in a set of 70s Golden Rams.

 

The Ever Changing Bag!  A lot of mixing and matching
Driver: TM 300 Mini 11.5*, 43.5", Phenom NL 60X -or- Cobra SpeedZone, ProtoPype 80S, 43.5"

Fwy woods: King LTD 3/4, Rogue Black 75X -or- TM Stage 2 Tour 3w, NV105 X -or- TEE E8 Beta 12*, Rogue Silver 70X
Hybrid:  Cobra King Tec 2h, MMT 80 S -or- TEE CBX 17*, HZRDUS 85 6.0

2 iron:  Arias D-23, Modus3 120 S; Mizuno MP-20 HMB, NS Pro 950 R

Irons grab bag:  1-PW Golden Ram TW276, NV105 S; 1-PW Golden Ram TW282, RIP Tour 115 R; 2-PW Golden Ram Vibration Matched, NS Pro 950WF S; testing: Arias D-23 5i w/Modus 120 S
Wedges:  Dynacraft Dual Millled 52*, SteelFiber i125 S -or- Scratch 8620 DD 53*, SteelFiber i125 S; Cobra Snakebite 56* -or- Wilson Staff PMP 58*, Dynamic S -or- Ram TW282 SW -or- Ram TW276 SW
Putter:  Snake Eyes Viper Tour Sv1, 34" -or- Cleveland Huntington Beach #1, 34.5" -or- Golden Ram TW Custom, 34" -or- Rife Bimini, 34" -or- Maxfli TM-2, 35"
Balls: Chrome Soft, Kirkland Signature 3pc (v3), Wilson Triad

Grip preference: various GripMaster leather options or Star Grip Sidewinders of assorted colors

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