I don't have a picture of the Flexwatt. I just ordered the 11 inch Flexwatt belly heat option that AP offers. They forgot to bring it to the show so they are mailing it to me and it should be here tomorrow. I assume its just regular 11 inch Flexwatt. If that is what you used then how/where did you "slide it in." I guess it is potentially possible that I could have gotten the wrong bottom as my bottom does have the grooves cut in it for the heat cable. I assumed they just had a standard code written for the CNC mill for all of the bottom options and only made one part instead of a specific one for the different heating options.