Heres what im using.

I use a 4-40 x 1in flat head screw with a washer on the front for added clearance with the big bores.

Low profile 4-40 lock nut. you can find these in other colors too.
http://www.bluegroovehobbies.com/ind...oducts_id=1096

I use one of the 2mm spacers to get clearance when using big bore springs. You can also find these in other colors or use 2 ball stud washers.
http://www.bluegroovehobbies.com/ind...roducts_id=710

Plastic shock bushings
http://www.bluegroovehobbies.com/ind...oducts_id=1026

I use the plastic nuts to hold it all in place.
http://www.bluegroovehobbies.com/ind...oducts_id=1025