I am nearing a point of making my Legnano rideable but I’ve hit a snag. To secure the stem I either need a 7mm x 170mm bolt or a very thin-walled, deep 10mm socket. Right now, the bolt drops into a narrow cavity in the stem hence the one fix or ‘thother.
(I’m scrambling around right now and forgot to measure the ID of the cavity in the stem. I’ll post that later.)
What I have FWIW.