Maybe try to find a small socket from a quarter inch set thats just right size to chase those check valves in, with a c-clamp, as Jerry suggests. Not too hard.
~Charley 1954 Chevy 3100 with 235 “Bud” Follow along in the DITY 1963 Chevy half ton stepside short box 230 1954 GMC 3 ton 302 And several more Chevy camper and work trucks 1979 1987 1996