Epoxy. You can use special epoxies, but I usually use the rather ordinary stuff from the hardware store that comes in the double syringe. The quick setting kind is not strong enough. Besides being strong, they fail at temperatures higher than you'd ever hit in a hot car, but easily achieved with a heat gun.
Use an abrasive on shaft and inside hosel, clean with acetone or alcohol, let dry, use 2 part epoxy on shaft and in hosel, join the 2 together, wipe off excess glue, allow to cure 24 hours before using.
Most golf club heads are attached with an epoxy resin glue. They are removed by heating the shaft with a torch to loosen the glue and pulling the head free. This can be performed by any proshop for a nominal fee.
Hosel is the the socket (or neck) in the head of a golf club into which the shaft is inserted.
A good epoxy, J B Weld or Araldite.
The socket is known as the hosel, it is where the head is connected to the shaft.
Once you have cut the shaft to the specific size you need, you then need to sand about 1-2 inches of the paint at the bottom of the shaft and smooth it to give it a good surface to stick to.
epoxy
The Hosel (one 's') is the socket or neck in the head of a golf club into which the shaft is inserted.
ho·seln.The socket or neck in the head of a golf club into which the shaft is inserted.Above retrieved from Answers.comViper1
Well it can be, but only slightly, you wouldn't be able to make a stiff into a regular etc. If you shortened a club, the shaft would become stiffer, and if you lengthened a club the shaft would become more regular, but you only make a 1-2 inch change to the shaft. What it does do however is change the swing weight. A lengthened shaft make the head lighter, and a shortened shaft makes the head heavier. All pro players like to have the swing weight the same for all their clubs. Apparently Tiger Woods can tell the swing weight just by swinging the club.
You did not give the speed of the club head. You did not give the weight of the club head. You did not tell if the golfer was hitting an English Ball or an American Ball. You did not give the compression of the ball. You did not give the type of the material in the club head. You did not tell the type of shaft.
Do you mean when you are waiting to tee off? Then the answer is no, you don't have to but you can do. You can hold it by the shaft, or hold the grip with the head on the ground.