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Does anyone know what the shaft size is for the titleist 690.mb irons? I think they are a 355 taper tip but I'm quite sure and I want to order some project x shafts to replace the dg 300's.

You are correct... I went to the Titleist website and emailed them to confim the same question about my 690 CB's. They responded within a day or two.

The 690mb's do have a taper tip, I called titleist directly. Finding taper tip might be tough, I called several golf component stores and all of them seem to be out of taper tip. My question is can I buy parallel and then drill the heads out.

Yes, you can. But I wouldn't try it unless you have a drill press and a good vice or jig to hold the heads.

You can order the taper tips through Golfworks or Golfsmith.

Definitely order the correct shafts, don't try to drill the hosels. A decent set of 690.mbs go for around $400 on ebay, but if you were to disclose that you'd drilled the heads to receive .370 parrallel shafts, I bet you wouldn't get any buyers at all. Besides, the clubs will perform better if the correct shaft is installed.

www.bandmgolf.com ... Ive bought many golf components from these guys too.

I had my swing speed check with a 6 iron, and it was 95mph. I don't know if I should go with the 6.0 , 5.5 , or the 6.5 project x shafts. Right now I have the s 300's. Can anyone help me with selecting which shaft would be best.

thanks Mark

The 6.0 is pretty close to the DG S300.

I'm looking for a more penetrating ball flight. With the s300 shafts I get alot of air.

Go with the 6.5 then or TT DG X100's.