I have a like new Russian (TAL) 1.25" rack and pinion (helical cut) 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. $30 US shipped in Canada or cont. US. Thanks!