Abstract: A prefilter for an EDM machine includes a tank for holding flush water with guide rollers and channels used to thread a continuous sheet of filter paper along the bottom thereof such that the flush water is prefiltered by the continuous sheet filter paper. A float switch detects the level of flush water in the tank so that as the filter paper becomes clogged, it actuates a take-up motor for advancing the filter paper through the tank to remove clogged filter paper therefrom and replace it with fresh filter paper. The prefilter may be used as a kit for retrofit to existing EDM machines or provided as part of an original equipment design.

Abstract: A device for setting a golf tee having a body with a side wall that has a tee-facing surface. A plurality of stepped recesses are vertically aligned and opened through the tee-facing surface. Each step section recess has a downwardly facing wall for contacting the top of a golf tee so that selective positioning of the golf tee within one of the step recess sections will allow the device to set the height of the tee above ground.