Update README.md

README.md

@@ -27,7 +27,8 @@ zund usb microscope tool with wifi streaming
 2. <a href='https://www.amazon.com/Supereyes-Portable-Microscope-Endoscope-Magnifier/dp/B0066H7H1Q'>SuperEyes B008 USB Microscope</a>, $95.50
 3. <a href='https://www.amazon.com/Anker-PowerCore-Lipstick-Sized-Generation-Batteries/dp/B005X1Y7I2'>Anker 3350mAh USB Battery</a>, $19.99
 4. Flat tipped set screw 5mmx0.8mmx10mm, McMaster 92605A233, $6.38 for pack of 50 (only need 8)
-5. USB type A plug (TODO, find exact link)
+5. Low-profile socket head cap screws 3mm (TODO, find exact link)
+6. USB type A plug (TODO, find exact link)
 
 For alignment, I find this 2.5mm hex-shank allen bit helpful: McMaster 7389A22