| If you know the 'brand name' do an online search and see if you can find the company. Their customer service should be able to help. If you have one of the screws, take it to HD or Ace Hardware and find more of the same kind. If you can not locate the maker, do you have any of the paperwork? If so it will show the type and size screw to buy. I did an online to replace parts of a kids playhouse a few years back and they sent the parts and a new telephone to me at no charge...nice of them. good luck | 
