You've discovered my dark secret!
I am totally unqualified to do such an undertaking, but I went ahead and did it anyway...I learned a lot. I finally got it running a few days ago and ten minutes later I found out that I forgot to route the clutch hose properly.
In the other thread that I linked in my first reply here I learned about those roll pins. The trouble is, nobody sells the hose.
I could take it and its fittings to someone who makes hoses, if I knew where to get that done (I have a couple ideas). I could buy some expensive, rare, takes-months-to-deliver fittings to DIY. Or I could try to fix it here.
The car came out far less hacky than I expected so I can tolerate a little bit of hackage here.
Good news: I found a compression fitting that will work.
The ones in parts stores now have a small tube that fits the inside diameter as well as having the sleeve that fits the outside diameter. They are designed for metal fuel/brake line and won't work with this thick-walled plastic tube. A year ago the ones in parts stores did not have the inside diameter tube...I know because I bought one to fix my fuel line back then.
Anyway, a hardware store had the old style, which will work for this. They also had separate
brass tube inserts that fit the inside diameter. I bought them to reinforce it and prevent it from being crushed in the compression fitting.
I'm pretty confident in this. One person in the other thread did it with a compression fitting two years ago and it's been fine. Mine runs higher pressure (stiffer clutch) but ought to be fine.