Purchased a used 18 ( My first WSM) and just had it shipped to me. Set it up today and the base wouldnt fit, the top wouldnt fit. Finally got the center section as round as I can but it is leaking like a sieve! Temp is hot with all vents closed because it is leaking to bad. Called Weber and so far they are not of any help. Any suggestions how to get it so it doesnt leak so bad, or how to get it round????