Between putting a shim in the dobby bar and realigning the bar with the the allen wrench I was able to weave 6 inches without errors or skipped threads! Thank you so much!
Yes it is a new-to-me used loom. The dobby bars are of the old type with metal linkages though I use zip ties. I am (trying) to work my way through your book and have a twill on the loom now. I have looked at mechanical dobbys on WeaveTeach and Weavo and have not had much success in finding an answer.