Gretch hi/lo pickups

[clayman]

Hi, I bought a 64 Gretch Tennessean, the budget Chet Atkins model 6119. I found it in a pawn shop and it's in good condition. Minor neck binding repairs, cleaning and truss adjustment. My question for someone that knows, can I adjust pickup height?
The 2 screws just hold the cover on. There are 4 screws that hold the outside of the bracket that surrounds the pickup. So if I loosen the 4 outside screws, will the pickup slide up and down? How do I raise a pickup?