Rule #3 of electronics: trust nothing and nobody. Don't trust the person who told you what they think is wrong with a thing. Don't trust previous repair work. Don't trust the instructions for your kit. Don't trust the manual.
Pull together all the information you can, and use your judgement. Then double-check. Then check again.
You might think that with three different sources of information -- say, the original hardware, the manual for that hardware, and the instructions for the cap kit -- they'd all agree, or at least 2/3 of them would, right?
Well. Not always.