I don't think those smaller holes on the inner side are drain holes, maybe for locating the part in a fabrication machine at the factory.
No idea what that big dimple is for either. I don't think it does anything for structural strength.
You did a good job of duplicating it. Wow $80 now? I paid less than $35 for each on mine, although it was back in 2015.
[on edit] Jim Carter still lists them for under $35, but I don't blame you for building your own.
[another edit] LMC sells them for about $25.
Last edited by klhansen; 01/10/2023 4:09 AM.
