@R93 - I don't believe that is correct. The white silicone covers a small screw and locknut that retains the actuator spring and enables it to be preloaded(this is close to minimum adjustment from factory in my experience).
The Howa HACT trigger modification that can be found on YouTube reduces the overly heavy trigger pull by reducing the preload on the stock actuator spring. By removing length from the spring preload is reduced on the actuator bar, lightening trigger pull.
Changing the sear engagement is a risky exercise for the inexperienced and certainly something that I would only get a trained gunsmith to do for me.
If you Google 'Howa HACT trigger diagram' there is a nice image that makes it easy to see.
I hope this helps! Cheers, Marc.
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