Update README.md

README.md

@@ -26,9 +26,13 @@ zund usb microscope tool with wifi streaming
 1. <a href='https://www.adafruit.com/product/3400'>Raspberry Pi Zero W</a>, $10.00
 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 M4 set screw, 8x (TODO, find exact link)
+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)
 
+For alignment, I find this 2.5mm hex-shank allen bit helpful: McMaster 7389A22
+
+Also, for tapping the M3 mounting holes for the raspberry pi, a tap is helpful (can also just use the screws to threadform).  E.G. McMaster 8302A12
+
 ## Building the scope