Owners of Officer sized 1911s have one common problem. It’s a chore when we need to strip the guns down for cleaning or maintenance. The officer sized guns like the Kimber Ultra series of pistols, have a short recoil guide rod and it needs to be compressed before the slide stop can be removed. Usually, you’d have to insert a small pin (I use a bent paper clip) into a hole in the guide rod to capture the spring, and then trying to hold the paper clip in place while trying to disassemble the gun.
You insert it into the guide rod after locking the slide back, as per the included illustration :
Looks like this :
then move the slide forward a little, and the take down groove will be aligned perfectly with the slide-stop. From there, disassemble the gun per normal. Here’s a picture of the captured recoil spring and guide rod.
He sells them off his site at http://www.1911ultratool.com./ and has models for Kimber, Colt, Springfield Micro Compact, EMP and Para Ordanance Hawg for $25.