7 wood shaft in 5 wood head?

Only 0.5 inch different in length.

In theory that would work fine. You even hear of people carrying 2 "4 irons" now, one of which is a match to the rest of their irons, the other being more of game improvement iron with a stronger loft and slightly longer shaft.

Regardless of the number on the bottom of the club (in your case a 5 wood), if you have 2 similar heads but one has more loft (due to you lofting the face up with a sure fit sleeve) and a shorter shaft - they should play differently. One thing to be aware of is that if you change the loft via sure fit adapter, you'll also change the lie angle and face angle - worth an experiment though! Let us know how you get on.

Thanks guys, will get hold of a 7 wood shaft and try it out.

i play a 7 wood shaft in my 917 5 wood, however just got a tsi 7 wood and hit it nearly as far but with much more control