Dave, Several ways you can go...one way would be to simply buy a new shaft and tip...high tech these days is with laminated shafts that supposedly give less deflection, along with layered pigskin tips for less mushrooming. I dunno about the less deflection thing, but layered tips make one really pay attention to where you hit whitey (cue ball)...be a little off and unintended english can result. Still, less likely to miscue, since they grab really well. These folks make a range of shafts to fit nearly every cue joint. Cue screws are made in SAE bolt sizes...
http://www.tigerproducts.com/
Another option is to send the entire cue to a good cuemaker for repair...but that could easily run more than the cue itself is worth. (Sounds like restoring an old P-car, eh?) Repair prices listed here are representative. Matt likes this cue maker for repairs to his cue, recently had Sheldon give it a stacked leather wrap:
http://www.sheldoncue.com/
Another option if you only wish a new tip installed is that you could mail the shaft to me, I'd take it to the cue ball the next time I go to Salem, and ask John to put a new tip on it. Last time he retipped for me, it was only $30 or so, IIRC...this with a standard non layered tip.
One arguement for a standard tip is that Matt just went back to them, a brand called elkmaster. He likes the consistant control they give him. Considering that he's currently the 2nd best player of the Northwest, I sure won't debate him on what works for him.
Oh...2nd best? He recently placed 2nd in the Western BCA regional 9 ball championships, men's master division. Bob Zack barely got him in a thrilling hill-hill match.
Video of the match here:
http://www.onthebreaknews.com/9BallWBCA.htm
Then click on "masters singles"...
What the video doesn't tell is that matches started at 9:00 A.M. This match ended at 3:30 A.M. the following day. I was whipped...and all I did was watch Matt's matches throughout the day. High level tournament pool is an endurance sport...not easy to keep up concentration for 18 hours or more.