Sold CMB 67 Twin Plug BRAND NEW

[Grimracer]

Glass isn't as flat as people think it is.
If one is going to stick with rc boating, a $55 investment in one of these granite tool room grade 'B' inspection plates is perfect for lapping. They have bilateral flatness +/- .0001".

https://www.grizzly.com/products/grizzly-9-x-12-x-3-granite-surface-plate-no-ledge/g9648

i use mine ALL THE TIME!