I had a lawn laid about a year a go and it is very bumpy. I rolled it
several times after laying but this had little effect. I know I should be
calling back the idiot who laid in the first place but is there something I
could try myself? Previously I hired a roller that I filled with water but
this did not seem very heavy. Are heavier, larger rollers available and
would they be any use to me?

TIA
G