When it comes to safety related issues I would always err on the side of caution. And even if Chris does get and fit the parts himself he MUST get it checked over by a competent person. Even if it's just a dry test that covers all the bases. And don't forget...., and we all know someone that has....., that an amateur can assemble the mechanism wrongly. And I freely admit that when I have worked on my car brakes I take it to my local friendly garage and put the car on the rolling brake tester.
I wonder if Chris will be back