How do I adjust the drum on a Mill City 500 gram coffee roaster? How do I adjust the drum on a Mill City 500 gram coffee roaster? How do I adjust the drum on a Mill City 500 gram coffee roaster? Miguel2018-10-23T13:28:25-04:00 In this post, we will answer the question; “How to adjust the drum on a Mill City 500 gram coffee roaster?” Coffee roast How do I adjust the drum on a Mill City 500 gram coffee roaster?Miguel2018-10-23T13:28:25-04:00