ER40 Collet Block

[JPMacG]

I'm not equipped to make good perpendicularity measurements. I did check the vise against a machinist's Tee (inexpensive import) and could see some light with a flashlight.

Since then I have acquired a 3" screwless vise, which seems to be near perfect in parallelism and perpendicularity. I now use the screwless exclusively except when I need to set up an angle.