There's another simpler way to get to 40 MHz which used to be available from here:http://gabezing.sytes.net/LC475-40Mhz-E.html

However, that site's been unavailable for a while and archive.org doesn't have copies. Does anyone have a copy or know of a mirror? We need to put those up.

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Just wanted to add that the original Hack of the LC475 is magically available again. i guess sytes.net has removed their restrictive robots.txt, wich in turn led Archive.org to list the old sites as available again. Enjoy "Reach to Quadra840AV? LC475-40Mhz-Clockup" by Hiromasa Yamaoka:

http://web.archive.org/web/20040219005118/http://gabezing.sytes.net/LC475-40Mhz-E.html