Steep learning curve here for me. If youse all will indulge me, there are terms here that are new to me.

"Large holiday in the lower head lug joint to headtube "??? Holiday?

"...a flat and hole for the B-spring"????

"...the lack of the binder ears having any internal reinforcement"???

Just when I think I'm getting to know something about bicycles, one of these theads comes along. Thanks.