I've done this mod and it's the best thing I ever did for my 707. That and the ride decay mod. I can't find the old documentation, but I have to open the old girl up to try some repairs soon so I'll take a photo if you still need it.
Cheers

--- In tr-707@yahoogroups.com , "roligafest" <roligafest@...> wrote:
>
> Hello!
>
> Anyone has information on how to do this mod
> Have searched old messages but all links are dead.
>
> Thanks
>