Hi, I would like to place the M68 OAG behind a Pegasus Falcon rotator (the rotator will be on the telescope side). How far does the M68's helical focuser protrude on the telescope side? I can afford about 10mm of spacers/adapters between the rotator and the M68 OAG on the telescope side. If the focuser protrudes more than 10mm, is there another, thinner option to attach my camera to this OAG? I use an ASI 290MM-mini cam. I would LOVE to find a way to make this work. Thank you!