just been reading through this thread, well not really just...its taken a few days lol, but the ultrasonic record cleaning thing I have also looked into as I sell vinyl and the cost of a moth or okki nokki is quite ridiculous!!! I use a homemade contraption based on an old turntable and an adapted arm currently, but its probably quicker to do by hand!!!! Have seen adapted ultrasonics for record cleaning and would be interested in making one myself, which ultrasonic cleaner would you be using in your conversions? I have read that the chinese versions are too low a frequency at 40hz, but for a 3ltr plus at a higher frequency the cost would likely reach that of the moths and co. wouldn't they?
Apologies for going a little off topic here