Have had Silent Gear installed for awhile... installed Silent Mechanisms. Upon existing world and new world load the following error was displayed in the command/chat area:

[Silent Gear] The following gear parts failed to load, check your log file:
silents_mechanisms:main/compressed_iron (SilentMechanisms-1.16.1-0.8.0+61.jar
silents_mechanisms:main/redstone_alloy (SilentMechanisms-1.16.1-0.8.0+61.jar
silents_mechanisms:main/refined_iron (SilentMechanisms-1.16.1-0.8.0+61.jar

But, the "parts" do exist in-game.

MC - 1.16.1
FML - 32.0.75
Silent Lib - 4.7.0+58
Silent Gear - 1.10.1+135
Silent Mech - 0.8.0+61

Great mods! - Thank you

Thank you for the update fix.