[Heathkit] HW-100 question

[Drew P.]

Dick wrote:

"Mine had a crack in it due to my being too clumsy with the  rig on the bench so I found a nice thin piece of clear plastic and cut it the size, then I used an etch pen and a ruler to cut a fiducial line in it about one inch long at dead center. I then glued the new window to the front panel using a tiny drop of silicone seal on each corner."

I have an SB-101 with a similar problem; the "fiducial window" along with the zero set knob and shaft are missing.  These parts do not seem to be available, and the assembly manual does not reveal much about the parts configuration. I've considered installing a fixed window as Dick has suggested, and to forgo zero-setability.

Drew