Finding not-so-odd parts for scopes, e.g., metric screws

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Anyone here have pointers to sources for knurled-head screws?

I have a couple of scopes/mounts which have lost some screws and want to
replace them. I can get nominal replacements from McMaster-Carr, but
the match is not-so-good. E.g., I need an M4-0.7mm pitch knurled-head
screw with a 10mm length which is the screw that holds an eyepiece in
place for the StarMax 127. McMaster-Carr's version has a 20mm diameter
knurled-head vs the 8mm diameter of the original. Although that might
be handy in the cold.... Another example is the screw for the CG-5
polar alignment scope. It's an M3-0.5mm. Again, I can get something
that technically replaces it, but the head diameter is huge. So, before
I go that route, I wanted to see if anyone else knows of a source.

The local hardware stored, including the big places like Home Depot and
Lowe's are hopeless, at least here in Brooklyn....

TIA,

roland
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PGP Key ID: 66 BC 3B CD
Roland B. Roberts, PhD RL Enterprises
roland@xxxxxxxxxxx 6818 Madeline Court
roland@xxxxxxxxxxxxx Brooklyn, NY 11220
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