Single pass stereo rendering convertion

Hi! I'm working with the ML1 and have to convert a shader to support single pass rendering. I have followed all the steps at https://docs.unity3d.com/Manual/SinglePassStereoRendering.html but i cannot get it working. I have not prior experience of shaders so would appreciate the help.

Shader "Custom/Stencil/Mask OneZLess"

{

    SubShader

    {

        Tags { "RenderType"="Opaque" "Queue"="Geometry-1" }

        ColorMask 0

        ZWrite off

       

        Stencil

        {

            Ref 1

            Comp always

            Pass replace

        }

       

        Pass

        {

            Cull Back

            ZTest Less

       

            CGPROGRAM

            #pragma vertex vert

            #pragma fragment frag

           

            struct appdata

            {

                float4 vertex : POSITION;

               

            };

            struct v2f

            {

                float4 pos : SV_POSITION;

            };



            v2f vert(appdata v)

            {

                v2f o;



                o.pos = UnityObjectToClipPos(v.vertex);

                return o;

            }



            half4 frag(v2f i) : COLOR

            {

                return half4(1,1,0,1);

            }

           

            ENDCG

        }

    } 

}