Grafton spring tension allen key size?

royaloaker

Old School Hero
time for a total redo of the '90 8900 & run into a head scratcher.while cleaning the canti's the set screw allen head seems a bit of an odd size.1.5mm is too small & 2mm too large.anyone recall what size fits the spring tension adjuster?
p5pb25671042.jpg
 
As above pretty sure it's imperial not metric. I've got some here. If I get a chance I will check.
 
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