Dude, a lighter is not enough heat and will leave soot on your platform. Go to Harbor Freight and buy the orange mini torch for about $5-7 or if that isn’t an option find one somewhere else. Use common sense when heating the bolt up so you don’t melt your starboard. Heat the bolt head up, spray penetrating lube on it and as the lube cools the bolt it will draw the lubricant in the threads. Repeat several times then try to loosen the bolt. Don’t get stupid with the torch and if the bolt won’t loosen don’t put all you have on it or you will break the bolt off and have a real problem.