Vintage Alignment Systems

Many You Tube videos on how to use the bubble gauges as above.
I have been using mine for 50 years.They do the job just like the wis-bang computer/digital $$$$$$$ machines.
That Alemite set is down right cool ! What ever you get it for the turn tables are worth it.
Would be nice if the owner knows how to use it.Maybe he has a book to go with it.That would make it priceless.