So today among other tasks on my new 420, I was removing the valves on the Onan P220G in preparation of lapping the valves. I started on the right hand cylinder first. First thing I did was make sure there were no holes large enough for a valve lock to fit down into. Nope, no big holes, so after compressing the valves springs, I popped the valve locks out with my tiny screwdriver. No problem. Next I did the left side. I ASSUMED that the oil drain hole would be the same size as the one on the right side. So I didn't check. Unbeknown to me, lurking out of sight, hidden by the valve spring, Onan decided to put a GIANT oil drain hole RIGHT UNDER the valve locks!! Really Onan? Really? If you have to have that hole there, how about a coarse SCREEN OVER THE HOLE??? So now I'm going fishing in that hole with a small magnet on a wire.... I know how this is going to end. I'm going to have to rip the engine out of the tractor, and completely disassemble it to get the freakin valve lock outa there.