I just installed my TruGlo TFX sights on my MK9 and it was not a problem at all. I used a cheapo Amazon sight pusher too and they were just as easy/hard as any other sight I've installed on a pistol. I'd say just take your time and adjust the tool when needed and you'll be fine. You can see the process and pics in this thread I posted:
http://www.kahrtalk.com/showthread.p...-TFX-on-my-MK9
http://www.kahrtalk.com/showthread.p...-TFX-on-my-MK9

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