Built our own revivor at the shop. 2 heat lamps (60 watt bulbs if I recall), a thermometer (box always stays at 125-130* but this is a precaution), a small fan to circulate the warm air, and the recurring timer on my phone. Wipe and rotate balls manually every 8-10 minutes.
Very simple and very effective. Takes a bit of dedication to make sure you're rotating them on time but it isn't too hard especially if you're sitting right there. Have had 2 balls crack but they were test balls with hairline cracks in them already. Forgot one in there for about 4 hours one day and it was fine so...
Eventually I am going to figure out a way to keep them rotating automatically but haven't got that down yet.
ALL STAR BOWLING & TROPHY
LANGAN'S ALL STAR LANES
IBPSIA MEMBER
WALLED LAKE MI