I'm using my Gen 4 G17 for IDPA and I keep expecting to get my hand caught when using the slide release. So I bought the backstrap kit and am trying to install the medium beavertail backstrap but am having issues. I can't seem to get all 4 holes to line up with the longer pin. This seems like it should be a simple task. Has anyone had issues with this and if so how did you eventually get the pin in? Mine is an early Gen 4 and does not have the tongue on the back that the beavertail backstrap snaps into. Thanks!