Take the pressure plate out (with a K3, it just pulls out, its not connected at all).
Now in bright light, simply take a wooden stick (like a tooth pick) and clean off any dust you can see. Its a very easy task. It should be done often.
rt
I run Nano Lab - Australia's super8 ektachrome processing service
- visit nanolab.com.au
richard@nanolab.com.au