Miata Mailing List: April 1994, Message #60
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   From: Jeff Hintzman 
Subject: Re: Diff Fluid
   Date: Mon, 4 Apr 1994 18:31:05 -0400

>  What size socket will fit the filler bolt on the differential? A  7/8"
> socket is too small so that means a 22mm should not fit. 24mm is too large
> and  nobody sells a 23mm socket. Anybody remember what works? I hate to spend
> $7  for a 22mm socket if I don't  have a need for it, and I refuse to use an 
> adjustable wrench.
> 

It IS a 23mm bolt head.  I think I was able to get mine loose with a 
15/16" socket, but I don't recommend it.  23mm sockets DO exist,
but they are not easy to find.  You won't see 'em at Sears or 
Kragen Auto Parts or whatever.  Look around for a good hardware or 
tools store that has a big selection and you'll find one.  Don't
use an adjustable wrench;  it's probably in there tight enough that
you will mess up the head of the bolt.

Also, I find that drain plugs are easier to knock loose when the part
in question is cold.  Anybody else experience this?  My procedure for
changing oil is:  knock drain plug loose 1/4 turn or so, run engine
at idle to normal temperature, wait for oil to drain into pan,
remove drain plug (begin careful not to pour hot engine oil
down arm!)

-Jeff