diff --git a/Ploopy-Trackball-Kit-Assembly.md b/Ploopy-Trackball-Kit-Assembly.md
index 737d2c6..08178f1 100644
--- a/Ploopy-Trackball-Kit-Assembly.md
+++ b/Ploopy-Trackball-Kit-Assembly.md
@@ -198,6 +198,9 @@ At the end, all of your bearings should look like this.
 ## Step 30: Insert roller bearings into top
 ![](https://lh3.googleusercontent.com/XnP0djOr1WwefBp4rDly1YdNyW2AQhd-coKtscZKv4xwLYQmJh_O-Yihrh0kl4qVAVJzwqvUfclbO-AARVt4Oj-sKAitXEjXrTa9eQkSTTAPYWJnLc7gkS8j-tN1GtmaKbSNINXwkJ6ZZMrajByS7vWSRSjNuC8hHUd_JKAmnY9irJVoUA94iEWYrB4KBVxBaU0esIEXEof3rUggpv_uvVDYDBlDYpmaFRC0tnzvHJRxh-NW0WDAP2H9yjmCHNOmo04t-DF5EK2o4DYGlYeZ-amr1TsrGEmFdWtrc61bnUenfm0Ulv03gWHOZauP4YzcY2UQReYbF-dNYhlvbFwStHIYuEG4NqCsLKivuc42vBo89eCMaUe34BptrLVSyakLd0pp4gIjZql1-fCpfeGk4Gql2eRTs9QVwKzJsBwZdpzvZLcKFdvOpXAkSpD-GL50yMmYE74fzZa5wMb_8JUfeaLCtKLGSdMXIuDj7CgYarGZHs0hIhD-ACPOcFSUXrhXLrK4qHVwiHV3OXJ99RrEamD6_zqgOKKweBi3jInbRoLBHl9HRzRL9QureF2lYC0jbQuoM6jrkkHSKEcjGtVyIJyOfErP4hwQwMo2PbWC-OmimmXa6t3s9LkQxW-vgFXw4GfPPEDDSHsh99zX4VRnrvDOXaqatlAfMJVqVTLfOBUb8dkteuhFbpbdQH0xvRvradtn3gbNgk3ScUEUsCPk_RUCHkUBFVKLJzOjqXzPIXoa03s=w1454-h969-no)
 
+- Ensure that the bearings are pressed all the way into the case. If the bearings aren't seated all the way, there's a good chance that the ball will become badly scratched.
+- Needle nose pliers or some similar tool can be used to ensure that the bearing is fully seated.
+
 ## Step 31: Put the top onto the base
 To put the Top on:
 - Align the USB-B connector with the Top.