and clamp 17 are loose to allow the t square guide arm 3 to be fit across a work piece and a second clamped or tightened position where the locking lever 15 facilitates the tightening of the clamp 17 against an edge of the work piece in order to fully understand the novel aspects of the present invention a short description of a conventional electric saw not shown is now provided the conventional electric circular saw includes a hand grip with an activating trigger adjacent the hand grip so as to be either activated or deactivated by the user the saw is also generally provided with a planar saw supporting platform through which the saw blade passes via a slot in the support platform a springably rotatable safety cover is often used to cover the exposed part of the blade below the planar surface the planar supporting platform has an outer edge which is often used by a worker to guide the saw along an edge or jig to produce a straight cut across a workpiece the outer edge of the platform used for guiding the saw is known as a saw fence the problem to be solved by the present invention is to provide a continuous guiding edge which will continuously abut the saw fence during a cutting operation in order that such guiding abutment.