Last week I ordered the Williams FA-1 AA Locos and they should be here next week. In the meantime I want to disassemble the wheels and axles on the Lionel rail cars I have been getting off of ebay. Are they easy to take apart? I want to clean the wheels and axle ends and the pockets they go into. Is it a good idea to put a dab of light grease or vaseoline on the ends of the axles? Thanks.