I was never a fan of the cheap aluminum bar clamp. They would twist like a pretzel when any decent amount of clamping pressure was applied.
Then I read what Paul Sellers had to say about these clamps, where he offered an easy upgrade path that turned them into decent medium duty clamps. You don’t always need the strength of a Bessey type clamp.
In this video I demonstrate how I perform the ‘surgery’. I recently bought two more Harbor Freight 48” aluminum bar clamps, at $10 each. This rounds out my collection to a final six. Spend half an hour in the workshop and $3 to convert your $10 clamps into $30 clamps.