FDB made both,

one with a driveway reflector rod , and one with a bicycle rider's flag rod. The bicycle rider's flag rod he says is very close to the real whippy. The one he gave me had the driveway reflector rod, which had a little less whip. Here's the basic procedure as outlined in another golf forum:

Go to the hardware store and buy what they call a driveway marker rod. It is a solid rod made of fiberglass of some plastic and roughly the diameter of a metal wood bore (.335). They are used with a reflector stuck on top to help people locate a driveway on rural roads at night.

I took an old pulled steel shaft with long parallel sections (4cm or so) between the steps and cut it off just below the grip just after a step. I then got a wooden dowel that was slightly too big to fit inside this step and sanded it down until it was the proper size. I then epoxied this into the cut off shaft as far as the step was long.

At the same time I simply epoxied the driveway marker rod into an old metal wood head as I would any head/shaft....ferrule and all.

The next day after both were dry I cut off the part of the dowel that was sticking out beyond the cut shaft and then drilled a hole (size of the driveway maker rod) through the center of the dowel that was epoxied into the shaft.

I then simply cut the driveway rod to the length required and epoxied it into the hole I drilled in the dowel. Viola....a whippy tempo master for about $5 US as I already had a pulled shaft with grip and an old metal head lying about.

To use the bicycle flag rod you need to build up the shaft some so the it will stay in the hosel. FDB said some type of wire...he used a ball pen spring for his. I haven't been able to keep the club on the end of the shaft, it keeps flying off after a few hours of use...may be my epoxy I dont know.

Use the tempo master for the clubs you have the most trouble with. If you hit your driver well but are quick with your mid irons, then buy/build a five or a six.