Pity , i just ordered (DMGRS) and had fitted an upper arm .
BUT its easy to see why they rust away ( mine apparently from the inside )
The two large ventilation/drain holes can never drain properly ,because the holes have upstanding rims which retain water instead of draining it away . This upstand seems quite large and must retain plenty of water.
So I suggest if you are getting them made , to get these holes punched from the other side , so the rim points down instead of up.
Probably too late now , but another example of masterful maldesign .
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