Dremel Cutting guide

a attachment for a dremel for cutting lines horizontally with grinding discs!.... the depth of cut can be set to score/rout lines but I wanted a design which also allowed the disc to 'pop out' when the attachment was pushed down. the spring allows the grinding wheel to be pushed down when downwards force is applied, but be rigid enough so that setting the depth works decently too. This way its much easier to guide in the wheel before starting the cut and then using the flat surface as a guide.