I have a set of Taylor Made 300 Forged irons with Precision Rifle Flighted 6.0 steel shafts. I find them a little too stiff as I am hitting them about a half club shorter then my previous clubs (which had a regular flex shaft in them). I purchased some Precision Rifle 5.0 steel shafts online and I was planning to make the switch to these. However, I didn't realize when I bought them that there was a difference between tapered and parallel tipped shafts. The new shafts I have bought are parallel tip and I am pretty sure that my TM 300's are tapered.

I was told that you can still put a parallel tip into a tapered tip club head by doing just a little bit of drilling. Has anyone done this before? Is the drilling likely to affect the structural integrity of the golf club? I don't plan on doing this myself, but I just wanted to get an opinion before I take it into a store to get it done.

Thanks in advance for any insight.