It’s very difficult to keep water out of the mast receiver and as FE Bob said it doesn’t seem to be a problem. Keep an eye on the tightness of the screws that hold the pin base plate to the receiver. They can work loose. You’ll need a long Phillips screwdriver.
I did have a broken pin on the base plate after many years of use which Hobie replaced free:
https://www.hobie.com/au/en/forums/view ... 75&t=53375Whether it was caused by water/corrosion over time or a manufacturing defect is unknown.
I did see an ingenious solution for draining the mast receiver by another user. He drilled the receiver and fitted a small tube with a tap. At the end of the days sailing he would just open the tap and drain the receiver water into the hull, then mop it up.
You can also use a kayak pump to drain the receiver but there is always some water that remains.
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Considering the lack of receiver problems posted here it doesn’t seem to be an issue.