Thanks for that. I will try to get thread locking compound that works at higher temps. I've used different fuels. All with no less than 20% oil as recommended by the manual. 16% nitro when I was running it in, 20% nitro and 25% nitro later on. It came loose with all. I did put the screws in when the engine was cold. Every time! I'm bald now after pulling out all hair! I'll try the thread lock and see if I get anywhere with that. Any particular brands that you know off? When I go to my car accessory shop and ask for thread lock that works at high temps they'll probably tell me that they all do just to get a sale or because they know no better. If I know what brand to ask for at least I know I'm getting the right stuff. Thanks again.