High double-key copy machine 
Set double-headed all the key advantages to a copy machine, about the distance between the two groups fixture design expertise. 
Left fixture may rotate two clamping keys, folders with four methods to target the key, right fixture may four key rotation fixture, the right group for the fixture-design, clamping two key points from top to bottom. 
Left. Right two-step guide to fine-tune the various devices can be cut to the depth of the adjustment quickly and accurately.