via this Reverb listing
You can find a demo of the upgrade previously posted here.
"This is a 'High Grade' version modified by Ishibashi / BIAS company, which enables you to change the pitch control of Low Tom and High Tom separately, using a mini-screwdriver.
The unit works fine as being tested, working on batteries is fine too.
There are slight signs of wear and marks here and there, but nothing serious.
Comes in an Original Carrying Case as pictured. Power supply is not included."
