Erico has come out with MP1P, which will solve your problems with installing wall plates in “old work” applications. The MP1P has 4 raised dimples on the front to use as a guide to cut a hole into drywall. This will help reduce errors in getting the proper hole size. The only tools you will need is a dry wall saw and a screwdriver to attach the wall plate. Simplicity is the word that applies to using this product. It is fast, effective, and saves you money. Contact us for more information on this product.