A method of removing selected portions of material from a base material using a plurality of different depth cuts such that apertured sections are expeditiously removed for eventual use with another component or otherwise. An opening is formed at the intersection of the two gutters and a rainwater head with attached downpipe is fitted under the opening. The light-shielding layer can include a binder resin, carbon black, a particulate lubricant and fine particles. During a test, the high-transfer-rate signal transmitted is received by, a receiver 23 with a switch 24 turned ON. The inventive sensor further comprises a device for detecting the displacement of the plate. The global variable is transferred through the invocation of a memory flow controller by a stub function.