As above really I’ve got a lovely middle burn crank (square tapered) sitting in the shed and I’m thinking of getting a Stanton slackline and want to run it 1 x9 .
Think I read somewhere you can’t run a normal chain device ?

You’ll need a seattube mounted chaindevice – something like a Pauls chainguide or this http://superstar.tibolts.co.uk/product_info.php?cPath=56&products_id=475

doubt the superstar item will. i had to modify the Pauls item to get that to fit. you will struggle to get the device low enough over the front ring without fouling the inner side of the crank arm (running an ‘uno’ chainring)