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Lolo
Hi,
regarding putting 1 1/8" forks in a 1" headttube, I have a pretty simple and straightforward adaptor idea (to be machined on my lathe), to accommodate a standard IS41 headset (for example this one) in an old 1" headtube.
This is so simple I am really wondering why no one has done it yet/why this isn't available ready to buy? Yes, space-wise it's getting tight, but it is possible, as a 1 1/8" steerer has a OD of 28.6mm and in my concept I have 28.7mm ID left, i.e. 0.1mm of air (better than nothing ;-). Also, the wall thickness of the adapter will be rather thin at 0.75mm, but this can be resolved by using stainless steel instead of aluminium for the lathe parts.
Check out my drawing here (red = adaptors) and let me know if have missed anything!?