I agree with this post.
I had sent to local factory twice as Speed force stem is not unreliable waterproofing.
I didn't ride in the rainy day but my sweat was getting into the small gap of LED laps on speed force, the circuit was damaged .
So I added on transparent protecting coating tape where the gap on speedforce as attached pics .
If anyone concerning about waterproofing issues on Speed force, i recommeded to use 3M made protection tape like me.