I use nothing but the Aeroquip hose with a true heat gun not a hair dryer and have 0 problems getting the fittings in.You have to heat the hose back far enough to equal the fitting length

70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4