“He won in January this year and we put him out in the paddock for a month when he got the puffs,” Comerford said.
“He really struggled and he then got an auto immune disease and went right off.
“He was boiling and his temperature got to 39.5 degrees when he couldn’t sweat so we had to keep hosing him down.
“He lost all his hair at one stage before eventually he started to sweat again once the weather turned.”
Hell Of A Boy recovered from last year’s setback to win second-up over 1200 metres at Cluden Park in October.
Since then, the gelding has started four times without winning but has placed at his past two appearances.
“He ran well two starts ago when second behind Trevor Rowe’s horse Smart Image and I did nothing with him after that run and he backed well behind to finish third to Yes Dream last week,” Comerford said.
“He’s stepping up to 1400 metres but he’s got a good record and he’s won three times over the distance.”
Comerford has retained regular rider Bonnie Thomson for Hell Of A Boy and rates topweight Echo Point and the Georgie Holt-trained Siren Rock as the main dangers.