sohnrad_04. 09, downtube fitting - an upcycling frame-building project

In episode 09, of the an upcycling frame-building project "sohnrad_04", the 4th bike I build for my son, I show pictures of the metering/fitting of the downtube.

The bottom-bracket-shell (with chain stays and seat tube) and the head tube are the fixed points, the head tube has to be fitted between these, the miterings has to be done very exactly.