Hi All- I saw a recommendation on TV to replace the super flimsy strike and bolt plates with a dual heavy duty plate. The instructions state if there is a 1/8" gap I can just surface mount the plate, which is what I've done temporarily here. Would you guys mortise it in? I bought a 1" chisel but have never done it before. ALSO: I've seen the recommendations to put in a 3" screw for additional security, but does this assume no sidelight? I'm almost afraid to drill a pilot hole then screw in a 3" screw. Thanks!