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If these are the original Steelheads and not the II or III, then they will take a parallel tip .335" shaft. This link may help on the shaft / plug installation:
http://blog.hirekogolf.com/wordpress/?page_id=17

Jeff Summitt]]> http://www.hirekogolf.com/jforum/posts/3055#8093.page http://www.hirekogolf.com/jforum/posts/3055#8093.page
JR]]> http://www.hirekogolf.com/jforum/posts/3055#8094.page http://www.hirekogolf.com/jforum/posts/3055#8094.page
I was thinking you were speaking about the woods, not the irons. But use a .370" parallel tip iron shaft. You may have to run a 9.4mm or a 3/8" drill bit inside the hosel to clean out the old epoxy and remove the small tapered portion at the very bottom of the hosel.

Jeff Summitt]]> http://www.hirekogolf.com/jforum/posts/3055#8095.page http://www.hirekogolf.com/jforum/posts/3055#8095.page http://www.hirekogolf.com/jforum/posts/3055#8096.page http://www.hirekogolf.com/jforum/posts/3055#8096.page