Assembling Roller Guide 23-120 & Corner Block 23-407

A quick learner from Vancouver says:
I tried to assemble Roller Guide 23-120 with Corner Block 23-407 .
The block hole diameter and roller guide diameter is same, 7/16".

But there are ribs around 7/16" post of roller guide base.
It makes the roller guide diameter bigger and it is very hard to push the roller guide into the block by hand.

How do you push into it? with hammer?
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Paul from SWISCO responded:
Ah, yes. They make it tight like that so that it won't fall out. I recommend using either a mallet or a block of wood and hammer.
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