I recently purchased a Davenport 0-4-0 on eBay, and can not easily pry off the lubrication plug that is located on the bottom of the engine. I do not have a manual, and was wondering if there is some trick to getting this plug off. I do not want to use force, as the outer rim of the plug is already deformed by my attempts to pry off the plug with a small standard screwdriver. Any tips would be greatly appreciated.