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2mm is ~ .080 and can make the holes a bit too large for my preference.
1.6 millimeter = 0.0629 inch Which is a bit smaller than 1/16th inch. So if you have access to American standard bits 1/16th inch is the way to go. If you can buy a Harbor Freight selection of small drill bits, The 1.6 will do the job but you will need to run it in and out a couple times to make the hole large enough in the washers and scales to allow easier assembly.
Just my take on the subject
Respectfully
~Richard
1/16th = 1.59mm.
2mm is not a bad drill bit if you want to remove a peened over head, but as Geezer says not good for actually drilling out 1/16th.
Then it comes down to drilling holes for rods that becomes very interesting and I think you should get your paws on as many small drill bits as you can.
Not all rods that are sold as 1/16th are actually 1/16th.
Some are true 1/16th, some are slightly thinner as they are designed to fit into 1/16th holes and others are metric 1.5mm labelled as 1/16th.