Gere"s a Link to 1 of my terrariums, where I used the Zoomed Cork.
http://www.frogforum.net/members/ram...terrarium.html
Please make sure you glue it with aqarium silicone to the glass. Seal the sides too so no feeder insect can burrow into thesoft cork backside. Let set, preferably under some presure of a heavy item, for appr. 24 hours, then rins so the vinigar smel can evaporate.
Have fun