Early this morning (before heading out the door to work) I replaced my original-rebuilt-with-new-seals (but not holding internal pressure) brake master cylinder with a new David Silver Spares assembly. The total time to swap it out, including moving the mirror, was only a few minutes. I then filled the reservoir, actuated the lever several times to bleed the air out, and wow what a firm lever! That was the best 10 minute motorcycle project that I can remember doing in a long time, I can't wait to see how it feels on the road, once the rain lets up a bit.