If you are keen on adjusting the azimuth, simply leave the door off, and adjust the azimuth with a small screwdriver. If you look at the head mount design, there are a group of toothed plastic wheels to adjust the head heights, tilts and azimuths for the record and play heads. The play azimuth is simply the largest toothed wheel on the right. It even has click stops, so you can easily return to the original setting.In my general opinion, any cassette is usually so inaccurate that it's not worth my time to set azimuth more than once, but I suppose if you are fussy and believe you can hear a difference, adjust it as often as you need. The same with changing the EQ. Most cassettes are made with the bias, Dolby level and so on, so out of whack that the minor change in IEC EQ on Naks is a non-issue to me. If it sounds off, simply EQ in the digital domain until it sounds good.