The sanke tap is easy to disassemble. I take them apart for cleaning all the time. take out the horizontal pin that the handle hinges on and it all comes apart. I usually want to get the probe out, and then I can clean all the insides with a brush. If the rubber parts are good then just soak the thing in beer line cleaner or similar, rinse well, apply food grade lube (keglube etc) to the rubber and go.
look at Micromatic's site for exploded diagrams:
