I'd think if it was taken care of then it should be good. I'd also think that the rocker would take multiple hits before failure. Hell its 300 bones. It better! Just give it a good look over in side and out. Sweet helmets are pretty boomer. I've used helmets for 5+ years. I see people in 10 year old protec's all the time. So, in the end its your head. If it checks out, I'd put it on my head. But that really aint sayin much. Good Luck.
I saw someone do it on youtube.