Steve,
The einstecklaufs are usually made for the right barrel and if you want one for the left,it is made differently.This seems that they are made to account for the barrel convergence. At the rear of the EL, there should be a third pad that moves back and forth by a screw that turns by a "key",that you may not have recieved since you bought it used.This pad moves on an inclined plane and tightens the EL up.There should also be a large screw head looking part that, I believe sets the headspace.This is usually set correctly, but the shotgun rim recess usually has to be recut to fit the bottom of this part,in other words the radius in that part of the rim recess needs to be cut square.This is usually done with the help of a jig that looks like the back of an EL with a cutter in the place of the headspace setting screw.Other methods of cutting it square can be used however.If the extractor has not been cut for the locator stud in the EL extractor, this will have to be done;or some people drive this stud out and scribe a witness across both extractors to locate the EL the same way everytime. Check the EL again and if it isn't like I described, post photos and I will try again.BTY the two moveable pads at the front are for adjusting the point of impact to the sights.
Mike
Last edited by Der Ami; 08/28/13 06:31 PM.