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That's dangerous: please stahp!
Have a look at this article, which should make things clearer.
Your frame was originally built to use "traditional nut style" brake calipers (as it's referred to in the article).
But someone has drilled the back of the fork (as described in "Mounting recessed-mounting calipers on older frames") to accept a "recessed mounting" caliper.
This is because modern, dual-pivot calipers (which are "recessed mounting") are much better at stopping you than old, single-pivot ones (which are "traditional nut style").
The problem you have, is that the tube nut (see the photo Si46 posted) is too long for your fork crown: modern forks have a deeper crown than steel ones, so need a longer nut.
If a helpful, local rider doesn't have a spare in their box of bits, try your LBS: any wrench worth his salt, will happily trade one for a packet of biscuits.
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Scilly.Suffolk
Hey forum hive mind.
I built an old moser frame on a budget last year and am slowly upgrading. Anyone know where I can find a front break calliper that has a screw long enough to go through the head tube on an 80’s frame?
Currently I’ve had to hack it with a ton of spacers while putting the washer in the hollow bit of the head tube. Neither sturdy, or practical! Hack/bodge photos to follow...
Any help much appreciated (don’t wanna drill the frame)