New inners - lube, grease?

What is the correct procedure when installing new inners?...in the past I've just whacked em in. Should I be doing something else?
"Why have that extra tooth if you're not using it?" - Brian Lopes
Votec V.SX Enduro 'Alpine Thug' 2012/2013 build
Trek Session 8
Votec V.SX Enduro 'Alpine Thug' 2012/2013 build
Trek Session 8
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There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
no foreplay at all?...charming
Votec V.SX Enduro 'Alpine Thug' 2012/2013 build
Trek Session 8
2012 Nukeproof Mega
2011 Haro Flightline Expert
2010 Spesh FSR XC Pro
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools