How do you change blade on Mk 470 tile Saw?

There is place on the shaft just behind the blade where a thin wrench can be fit in to hold the shaft. If you are like me, you lost the original shaft wrench. I had to manage to get the blade off by holding the blade and impacting the blade wrench repeatedly

• the quick whack made it start to move little by little each time

I whacked it until it began to loosen. Only then did I discover that there was a place just behind the blade where you could put a wrench on the shaft. It needs to be a relatively thin wrench. I don't know the exact size, but a 19 mm holds it well enough so that you can tighten or loosen the blade nut. If you have wrench about that size and thinner than a quarter inch, it should work.