GSO makes a nice crayford - I have one on my reflector. They also make refractor models - and I see they have an adapter rings specifically for your scope. Lots of folks sell them - but I am partial to Agena http://www.agenaastro.com/Pages/Products_AllOther/products_Crayford_Focusers.htm) as shipping/taxes areincluded - Manish is really easy to work with.
Jim
Jim
