Spawners are craftable from eight spawner fragments. You obtain fragments by breaking spawners. The fragment is different depending on what kind of spawner it came from. So you can turn eight skeleton spawner fragments into one skeleton spawner.
However, you can also include a mob head in the middle of the spawner fragments (this would necessitate more mob heads being available). Using mob heads, you can turn a random mixture of spawner fragments into a specific spawner type.
This means that to have a spawner where you want it you have to explore enough to find eight spawners of the same type, or eight spawners period and obtain a mob head of the mob you want to spawn.
This mob head based crafting recipe could be limited to spawner types that currently exist in world gen or open new spawner options, such as creeper spawners.
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