--- "Josephine M. Grahn" <bsi@xmission.com> wrote:
Jim, Sorry, I was not trying to make an engineering comment, just a "user observation". Of course the legs have to have a certain spread for stability, and there is a relationship between the spread of the legs and the length of the parallelogram, along with the height at which you expect to use it.
It's not that complicated. There are limits, to be sure, but strict relationships need not be maintained. The engineering constraints on Glen's crutch mount, for example, were: 1: The length of the crutches he found at D.I. 2: The tripod he already had on-hand. (also from D.I.) The arms were too long, the tripod too short and narrow-stanced. And it worked beautifully! Now, if you want to build one to precise dimensions and arm-tripod relationships, go right ahead, but I wanted to be sure no one felt intimidated. In most cases, if it looks right, it is right. Jo and her husband are capable of beautiful, functional, meticulous work, but the crutch-and-two-by-four method will get you there, too. C. __________________________________________________ Do You Yahoo!? LAUNCH - Your Yahoo! Music Experience http://launch.yahoo.com