For enlargeing, dodging using a pencil on 0.0003 inch frosted mylar with a diffuser between the mylar and negative when printing works well for me. For burning just cut the frosted mylar where you need to burn. Both these methods are quite precise when pin registration is used.
Masked precision flashing can be done on your easil using Orange Opaque material cut out where the flashing is to be done. A piece of 1/8th inch plastic with a piece of frosted mylar taped on top should be used as difusser. Use a spacer between the edges of the plastic/mylar (i.e., the difusser) to provide better difussion.