I've just added a Cumbria Designs X-Lock 3, "Huff Puff" VFO stabilizer to my K1. The performance is amazing, no drift and no issues with using RIT (or XIT). Cumbria Designs are at: http://www.cumbriadesigns.co.uk The installation details are on my web site at: http://www.astromag.co.uk/pdfs/X-Lock_K1.pdf 73 Dave, G4AON