1. The measuring ribbon inside the tram is sloppy. All measurements must be measured by fully closing and re-extending the tram / ribbon.Sloppy by a full 1/4". 2. The tram sags in the center when opened to 76". This causes the tram pointer to push out just over 1/16" beyond actual presenting a false reading. Actual reading (with sag) is slightly more than 76 1/16". Preventing the sag and deviation presents a precise 76" measurement.
Lesson learned. Will re-measure the points tonight now that I've "calibrated" the tram.
