The hammer lug is often Loctited in to the hammer to stop it coming loose. As such, it does initially require a lot of force to get it moving. There is a risk that you could round off the end of the Allen key if it is a loose fit, and a smaller chance that you might round off the hole in the lug (something you definitely want to avoid).
If you are concerned with the amount of force you are having to use, remove your grip frame as described above, and then hold a soldering iron against the bottom of the hammer lug. Heating the hammer lug will soften the Loctite, and should make it easier to turn the lug. Once you have adjusted the lug, and let it cool down, the Loctite will re-set if it hasn't been totally degraded by the heat.
It's just like a battle zone, you got a bottle and you're on your own.
Gotta be a Scotch or a Kamikaze, none of those other weapons will faze me.
Hundred, hundred, hundred bottles on the wall, you wonder if you can drink them all.
Got to go home by 1am, the bottle wins the battle again.
Husker Du - "First of the last calls"
Back when I was popular
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