Hi Chris,This is the first time that I have ever replaced a Reising ejector.As was stated in one of the previous replies,on most guns you can see the circle of the end of the ejector on the outside of the receiver. The only way to install a new one is to insert it from the inside.So obviously to remove the broken stud,it has to be driven in from the outside of the receiver.After removing the broken piece,I carefully cleaned up the hole with a fine rat tail file,and checked to make sure that the stud would just start in the hole.I then tapped it into the hole with a brass punch,ensuring that the ejector blade stayed level with the receiver,until it bottomed out.There was no slot in my receiver to keep the blade aligned.I then had to file the end of the stud flush with the receiver,and put some cold blue on to finish the job.I have not fired the gun yet,but will post if I have any problems.Thanks Ed