Wadia internal switch

Does anyone have experience with opening and manually pulling the internal switcht for output voltage Wadia provides?
My 521 definitely needs it for my amp.

Would like to know if it is very easy to do, do you open the top with the screws on the bottom?

Thanks a lot in advance!
Yes, very easy in addition to the allen head bolts under the feet there are more around the sides. have the player on its side when you remove the screws.
It's nothing difficult, just some dip switches. I think yours are internal like on my 861. But check first. My 302 has them on the back plate. I've never set them on a 521.