I assume you are using the M12V in a router table? If so, Sommerfelds tools for wood seels a bent wrench for use with the m12V. It allows you to change bits from above the table without removing the router from the table.
I use mine in a Sommerfeld table with the wrench and can't live with out it. Their website is www.sommerfeldtools.com. I don't work for them, just have some of their products which I do like very much.
I have a M12V. Look arount at flea market or pawn shop and pick up a 21mm and a 24 mm open end wrench(s). A friend of mine took the 24mm to work and "thinned" it out on a mill. Of course I always take my router out and on top of the table to change bits the same way Bob and Rick did on the series when they used their M12V's.
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