FCS boring depth

I have only shaped with glassed in fins so far, I like my boards thin. Does anyone know what the min depth for FCS is?

I have only shaped with glassed in fins so far, I like my boards thin. > Does anyone know what the min depth for FCS is? The normal depth of the hole is 1.8 mm or approx. 3/4 1nch. If the board is to thin you can lift the plug alittle, but there should be .2mm between the bottom of the plug and the foam in the hole. Hope this helps.