This side-by side setup is based on a large vixen-compatible dovetail (designed by myself and manufactured by my friend Janusz Pleszka from Astrokrak company). A small vixen-compatible saddle from teleskop-service.de is attached on one end, while on another there is Takahashi guiding mount TGM-2. The fixed saddle is used to carry SKY90 while FS60 is attached via it's standard clamshell to the TGM. Both scopes can be adjusted to point in the same direction.
This sbs attachment is very useful for star-parties and public sun showing. SKY90 is used with Hershel wedge while FS60 with Extender-Q (similar focal length) with Coronado 60mm Ha filter. While using similar eyepieces, views in both scopes can be directly compared.