Tracker bar components.

A different approach to constructing the tracker-bar is shown here.  Instead of using John's method, which I'm sure is perfectly satisfactory, I thought I'd try a design e-mailed to me by Walt Lysack, who wished to help after seeing, via this site, that I'd started to build.  Thanks Walt. It works fine and is quite easy to make. The jig for drilling all holes can be seen at the top of the picture.  I prefer to work in metal as I find it is much easier to mark out and drill this to greater accuracy than wood where the drill seems to wander wherever the grain takes it.  I don't like to see a row of holes noticeably out of line, although it would probably make little difference to the working of the organ. Errata: The two holes next to the bass holes in the base-plate should also be of the larger size. This was corrected before assembling the tracker bar.

"He who never made mistake never made anything":   Confucius

Holes have been squared off at the leading edges and bass holes lengthened.  The top of the tracker-bar was planed and sanded to a suitable curve and all dust removed before gluing.  It is essential that mating surfaces are perfectly flat to ensure there are no leaks between compartments. To provide an airtight seal when mounting the assembly in the pressure-box, I've used a piece of soft plastic sheet.  Thin smooth leather, (lamb skin), would probably be just as good, if not better.  Of course, the two surfaces must be as flat as possible.  Metal tubes have yet to be fitted. All dimensions can be obtained from John's plans.