I purchased your Robert Shaw style thermostat for a 345 and because of all the forum talk of poor quality (in general, not necessarily those from IHPA) tested it this am prior to installation. How far should the poppet separate below the flange? I couldn't tell anything moved at first, but then noticed the poppet dropped about a 1/16 inch below the flange (reproducible, 3-4 tries). That doesn't seem adequate. How far should it separate?