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If it's a new US strat it should come with a tiny black spring to drop in the tremelo arm hole (black's easier to loose). The block in the US strats has a drilled, blind hole that's tapped for the arm. It's designed to accomodate both arm and spring to provide a degree of stiffness to the arm.
The mexican Strats have a cast tremelo block, from a different, softer material. This is designed to take the arm only and no spring is supplied. It's not unknown for people to try the spring on the Mexican bridge and find the spring drills through the bottom of the block (a personal experience too).
A vintage Strat (or newer repro) will have the stronger block material, but no spring, it's a recent (90's on?) Fender thing.
A good cure for the problem that avoids springs is to wrap the arm in PTFE tape as it's inserted. This reduces the slop and provides a degree of tension, depending on how much you use.
Hope this helps.
Gary
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