I have a like new Russian (TAL) 1.25" helical-cut, rack and pinion focuser
for sale. All metal, except for the focuser knobs. It was made to fit a 7"
OD tube (their 6" reflector). Model # is FC-RP1. I have included a picture
from the talscopes web-site (but you can read more about it there -
search for talscopes). It includes the extension tube (for astrophotography) shown in the picture. $30 US shipped in Canada or cont. US. Thanks!