Hi there,
for any parts try this guy in the US
http://astronomy-mall.com/astro.parts.outlet/
can't help you with the manual but I would imagine you use it the same as a Ha PST. Remember the picture is much darker and it's better if you just take photos as the human eye is not very sensitive at the CaK wavelengths.
Hope this help.
Clear skies and sunny days
Huey