On my 71 Demon I did not have one of those rubber bushing so I filled the cavity in the master cylinder with a Black RTV and placed the pushrod in it over night. I used that for about a year or so, one morning backing the car out of the garage I went to step on the brake and the pushrod had fell out. Car did not go anywhere that day and counted it as a blessing it did not happen at the track.

I called the Doctor on the next Monday and ordered a few of those rubber bushing. Still got one left.

Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)