I noticed the bearing where the shaft goes through the hole, leaks significant water. I have made a seal - printed in Ninjaflex - that holds up nicely. Have a look - you can maybe consider this also for your upgraded design. If you want I can sent you the STL's. It is a 1 mm seal - to be printed in flexible material and a 2mm press piece. The flexible seal hole diameter is just slightly smaller than the shaft, thereby blocking a lot of water. Use 8 mm M3 bolts instead of 6 mm. This keeps a lot of water out.