[redcsctrike]

Thank you Charles! Nice to know the pointer has a scribe line on front and rear to reduce paralax. The knob which is present has a smooth back without any way to hold the plexiglass to it. I'll obtain a replacement knob and make the pointer. Thank you for the information. I thought there might be strict dimensions for the pointer. It will be easy to make now that I know what it is.

Everything works great with the tester. Might need an operator upgrade though...

Thank you again for taking time to respond!

Best,
Roger