Hello. I have a Jackson KVX10 with a JT390 Adjustable bridge with strings through body. My question is; how the heck do you access the intonation screws when the strings are on. They're impossible to access.

Also the bridge fell off last night when I was changing strings & turned my guitar upside down while cleaning. When I put it back on I couldn't remember if the intonation screw heads are supposed to be inside facing the pickups or on back off bridge. Anyone have a JT390 adjustable bridge they can look at and advise?

Thanks.