Mark, I have a 12" SW Collapsible Dob and was looking at fitting a Telrad. The secondary mirror housing on my scope is 19 cm in length (between the white bans) while the base of the Telrad is 21 cm, which means -it don't fit. How is yours fitted?
Looked up the Telrad web site and they give dimensions as:
Length 21.3 cm
Width 4.7 cm
Height 12.7 cm (mounted on base)
Weight 30 gm.
Rod
