For sale is a Tapping parallel arm. It is about 31 inch tall .Also comes with the mounting post. This arm is new, it was never used and it is in perfect condition. The post says THOMSON. You can use it for tapping threaded holes, or as a mount for a salad plate. The plate would then follow you and will be perfectly level.
According to the person from whom I bought it, this arm costs $2,200.