Just want to say thanks for the help! This is my first time rebuilding a rear master cylinder. I used the recommended Mikes XS switch and used the HVC Cycle rebuild kit. I bought a Harbor Freight ultrasonic cleaner and ran all the parts through it a few times. It took 3 tries to get it done; the initial rebuild, but wouldn't build pressure; disassembled and cleaned the "little hole," that even the ultrasonic cleaner didn't get, still wouldn't build pressure; disassembled, re-cleaned the hole and reassembled adding fluid on the bench and ensuring the clips were in correctly - starting building pressure immediately. It was a learning process and well worth it. Everyone should get a ride on one of these motorcycles in their lifetime 