Hi I know this may be sacriledge to some, but the screws that come with a lot of the bike computer mounting kits nowadays (3mm threads) fit the dropouts perfectly, and the original head will screw straight on too. They are available in a variety of lengths.
Neill.......never picky.......Currie
595-B E. Deering Rd
Deering
Nh 03244
tel: 603-529-6472
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I usually have classic bicycle components for sale at good prices. Please
email me for a current list. A reasonably current list may be seen here:
http://www.geocities.com/