CORE DRILLING THE DAY AWAY

I've been running this thing for the last 2 days...6 holes yesterday,7 today.
This is an older drill and has some quirks.Sometimes when you penetrate to the floor below the entire bit falls through!Sometimes the bit binds up and shears off the pin holding it in place and you have to move the stand and bang on the fucker until you free it.The water supply valve leaks.so the spinning bit throws water everywhere.
Always exciting...