That's a good one Low. And cost effective too. I always wondered why you need to buy these mail-order gadgets when the simplest tool will work even better. I remember someone making a home-made version of the "inside approach" with coat hangers and one of those foam swimming noodles kids use.

If you go a lesson this winter, most instructors use video these days and the major part of the instruction is to build your swing plane. There are different theories as to what's good and bad, but consistency is the key to golf.