I thought i would swap out my front and rear sights to red ramp & .146 white outline rears. Bought the kit from Brownells. Watched the Brownells video and though "Sure I can do that". Front went without issue, drove pin out, tapped out black blade Measured for correct width & height. Tapped in new red ramp drilled with #54 and tapped pin back in. Thought Groovy. Turned windage screw until it snapped just like video. pulled screw head out and plingo, spring and detent flew. After much searching found the spring but no detent. Had to order the kit#078001001. What a PITA. Friday the 13th got me.