In my experience, good advice is rarely heeded. Same job (breaking hard limestone in trenches) we still needed the jackhammer to break up the lumps the gelignite had left.

'Never put the jackhammer bit in a shothole!'

But it's much easier - until the day there was a missed stick in the hole. Being a hot summer day, boyo was working stripped to the waist. He now sports an interesting pattern of scars all over his chest! Luckily, nothing worse.

Phil