I drilled the hole for the Co2 IN line at the top left back wall after removing a little insulation to check coil position. I replaced all insulation with new cotton candy-type insulation. Be sure not to tighten the shank nut so hard as to bend in the freezer walls. If you plan to add another tap in the near future, drill the hole now and cover with duct tape. I would greatly appreciate some help from the organic chemistry gurus as to what exactly an ester is and more importantly what they taste like in beer.
Esters are compounds that are sort of like alcohols bonded to acids.
My understanding is that they can be created without intervention by yeast, but that process is very slow. The yeast, however, can create the bond much more quickly. Two factors that are undisputed are temperature and yeast volume. Low temperatures and high pitching volumes tend to reduce ester production. The opposites, of course, increase ester production.