Final answer:
The question is related to engineering, discussing interference fits in mechanical assemblies to prevent the movement of parts. It is incomplete but suggests that securing a metal peg with a tight fit could prevent a hammer from moving, which could be true depending on the specifics of the design.
Step-by-step explanation:
The question seems to pertain to the field of engineering, specifically involving the fit and tolerance in mechanical assemblies. The phrases 'leads to prevent the hammer from being raised against the head block' and 'a tight fit of a metal peg in a hole in a metal block' suggest it is discussing mechanical connections and interference fits which are common in engineering designs to ensure parts remain securely joined without the need for additional fasteners.
However, the question itself appears to be incomplete or lacks sufficient context, as it does not fully explain what 'leads' refers to in the context it is given. Typically, in an assembly requiring an interference or press fit, a peg would be designed with a slightly larger diameter than the hole it will be inserted into. When the peg is pressed into the hole, it deforms to fit the hole, which ensures a very tight fit. This tight fit can prevent the movement of the parts without any additional restraint, which in the context of a hammer and head block could mean that such an interference fit would prevent the hammer from moving or being raised.