I first used a set of ski poles that I bought for 2$ in a yard sale. Since they were 1 piece they were fairly strong. I now have good locking trekking poles that have held up well. I wouldn't trust the locks on the cheapos to take any weight in case they had to. The poles can prevent falls and injury or cause them, if you rely on them bearing much weight. I'd test them first, before relying on them.
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Charlie