ah, 200 bucks is cool.
Now, just wait when you get it. Check visually the tape path/heads, clean heads (it does not hurt) and give a test drive. If it gives you any problems, then think about "servicing" it.
Don't stick a screwdriver of any kind anywhere needlessly.
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What are the cassette tapes you are planing to play/transfer to digital?. Are they commercial or are they home/self recorded. If self-recorded - are they from the same person (meaning been recorded on the same machine) or from all over the world?.
"Tweaking" the head's lil' screw may be helpful and maybe even needed, but chances are you don't have to do it at all... it depends.
That's why I've mentioned a deck like DN770R - because
A: it's bult to handle heavy 'commercial' use (meaning if you are buying one used from a home environment, the chances are it IS still in great shape, but if you are buying anything! used from pro-studio - WHATCH OUT!

), and
B: it has two in one, so you can mess with one deck if needed or feel like and not worry about screwing up (there's no much to scew up there to begin with, but still), another words, you keep one deck adjusted to "standard" and the other one - you can tweak to get "best possible" playback for home-recorded cassettes (that's if this is what you are working with).
...anyway...since you are getting 112MKII ... it's all blah blah. You are getting a beautiful machine, a bit overkill in your situation (imho) but, it depends on how you look at it.
Also "servicing" it at a commercial service center (or local tech service place) may cost you another couple of hundered bucks. Hopefully you don't need it.
good luck
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and,
Dave, you should start issuing something like
THIS. Be creative, make it nice ... but don't make it looking like a pink ribbon, it may be taken as an insult
/respects