Tramming your Vertical Milling Head

I have a new disc brake rotor I use to tram in the vertical head.
 
when I can't get low enough to reach the table because I have something mounted already. (This happens sometimes when you break an endmill and want to check the head before continuing. Anyway, I use 2 blocks (1x2x3 or 2x3x4 ) and tram from one to the other.
 
A large block is super useful for this. I have a pair of 12" ground blocks and it's super easy to wipe the table, set the block on the table, extend the quill 100% and retract 100% while in contact with the block. Split the difference and double check on the table.....takes less time than anything else I've tried.
 
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