I didn't realize that you made custom lids. I needed one for my one liter beaker and had to make it by using two different hole saws to cut it out of the same type of material as the one that came with the SilverTron. I think it was meant to be a cutting board for food. I only had a battery hand drill and not a drill press, so it was a little difficult to hold. I then used the electrode holes from the SilverTron lid as a guide to mark the holes on the larger lid and drilled them out with a small drill bit that made a nice friction fit for the 12 gauge rods. I drilled two more holes at a right angle to the first holes , but I made one of the holes large enough to accomodate an 8 gauge rod. It fits really nice on the beaker, but I would have bought yours if I knew you made them. It's too much work without the right tools to do it with. It basically looks like a bigger version of the one that came with the SilverTron with an extra pair of electrode holes.
Art