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Some nice bikes just come up on the Retrobike forum:
http://www.retrobike.co.uk/forum/viewtopic.php?t=22648&highlight=
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Great stuff. Don't try and make a frame watertight - you can never keep all the moisture out. Far better to have drain hole so it can 'air' and water can get out - I usually drill a small (4mm or so) drain hole at the lowest point of the BB shell.
Every now and again give a squirt of GT85 in there and in to the other vent holes you will find in the frame tubes.
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I would do as Chris advises but a good tip is to gaffer tape a 'Scotchbrite' pad to a piece of dowell or cane, soak it with WD40 or GT85 and run it up and down the seat tube. Use a small (brass) wire brush to clean out the BB area running it 'round' the threads. RInse everything very well with more solvent. I always clean out the top of seat tubes especially like this and finish off with 180 then 600 grade or so wet and dry to get rid of any burrs (that would knacker a nice Campag post...)
If you want to preserve a frame you need to use Waxoyl or similar but thinned 30% or more with white spirit, heat it in a bucket of boiling water and pour into a warm frame (with all but the seat tube taped up) - twirl it round every which way and let the excess drain.
One very well preserved frame.
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Would agree with Roberto - one of cycling's best advances in the last 20 years was the cartridge BB. Shimano UN71/72/73's are legendary but a brand new genuine Campag cartridge BB can be bought for little more than £10. I would spend a little more though on a higher spec model (Chorus/Centaur) - or buy a SH one on eBay.
The other thing is to look very closely at your bearing tracks - like headsets they can become overtightened and you end up with tiny depressions in the surface. Known as 'indexing' - makes the bearings all notchy as the balls run in and out of the depression. Throw it away in that case - new balls will not help.
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Twas ever thus...
You've done what most of us that are 'into' bikes do and built a custom bike from the frame up.
However, anyone else in the market for a niche item like this will not want your custom spec but their own and will pay less for the compromise or the hassle of breaking it up and selling the bits...
Selling complete will get you perhaps 70% of the value vs splitting.
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For any bike related decals Gil M is the man as per above. He is hugely helpful.