Mark, Mazdatrix used to sell a thin wall socket just for that purpose - but, as I recall it was a bit pricey. You might try searching their web site.
Ed
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com <mailto:eanderson@carolina.rr.com>
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.dmack.net/mazda/index.html

    ----- Original Message -----
    From: Mark R Steitle <mailto:mark.steitle@austin.utexas.edu>
    To: Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
    Sent: Monday, October 23, 2006 11:47 AM
    Subject: [FlyRotary] Re: Flywheel nut

    While we’re discussing tools, can someone suggest a brand of spark
    plug socket that is thin enough to use with anything other than
    the standard rotary spark plugs? I tried the NGK Iridium plugs
    last weekend and had trouble getting a socket that would tighten
    them the final 1/8 turn. Rather than grinding down my current
    socket or modifying the rotor housings, I would like to purchase a
    thin-walled socket. Any suggested sources?

    Mark S.

    ------------------------------------------------------------------------

    From: Rotary motors in aircraft
    [mailto:flyrotary@lancaironline.net] On Behalf Of Dale Rogers
    Sent: Monday, October 23, 2006 10:28 AM
    To: Rotary motors in aircraft
    Subject: [FlyRotary] Re: Flywheel nut

    FWIW, Snap-On wrenches and sockets have offered that same
    feature - off-point bearing "flank drive" - for over 20 years.

    Dale R.
    Donald Willard Garrett wrote:

    Years ago, I stayed up watching one of those infomercial shows,
    and made what turned out to be my favorite tool purchase ever.
    When they got stolen from my car, I bought the deluxe set, and
    like it even better. Rather than turning the corners of the nut,
    they cam onto the face, meaning:

    1. each socket / wrench does both metric and the nearest fraction of
    an inch
    2. you can't strip a nut or bolt head with them
    3. you can turn a nut or bolt that's stripped almost round

    Additionally, I've used (abused) them with cheater bars, and am
    confident that anything I can get a socket on I can either crack
    or twist off the bolt (like the head bolt on a Chevy 454--oops).
    I've pulled engines etc. foreign and domestic, and handed them
    over on numerous occasions to jobsite crews when regular hex
    wrenches fail (tool sacrifice--watched guys hang from them and hit
    them with hammers) with zero failures.

    There you have it, of all the tools I own, the only ones I'd ever
    do a commercial for!

    http://www.mitools.com/