With that much corrosion, it may be difficult to disassembe. but you'll find
a very small retaining screw on the round part of the handle where the lock
fits in.  Remove that screw and the plug slides out the front.  Expect,
however, not to be able to remove the screwif everything is highly corroded.
  If you drill it out, note that it's not just a set screw, but has a
special tapered tip.  We frequently find the wafers badly corroded and
requiring replacement, along with the springs.  Repairs are not impossible,
though.
Steve Sandlin, Registered Locksmith
http://www.steveslockshop.com
'84 Wolfsburg Westy, '79 Transporter, '00 New Beetle

_________________________________________________________________
Find and compare great deals on Broadband access at the MSN High-Speed
Marketplace. http://click.atdmt.com/AVE/go/onm00200360ave/direct/01/