Update assembleyourcard10.md: add note about nylon spacer thread damage

en/assembleyourcard10.md

@@ -17,7 +17,7 @@ When unpacking and assembling, make sure to keep your protective foil on the dis
 <img class="center" alt="attaching the spacers" src="/media/assemble/IMG_20190819_142944.jpg"  width="420" height="auto" align="center"> 
 
 - attach the spacers with four of the screws
-- put the nylon spacer next to LED3 (_the nylon spacer is not symmetrical, the flat side should face the fundamental board screw_)
+- put the nylon spacer next to LED3. The nylon spacer is not symmetrical, the flat side should face the fundamental board screw. Be careful not to fasten the screw too firmly to the nylon spacer, otherwise you risk damaging the thread in the spacer and the screw will become loose.
  
 <img class="center" alt="both boards placed on top of each other" src="/media/assemble/IMG_20190819_143114.jpg"  width="420" height="auto" align="center">