Hi,
I think the 98100 part has some problems.
http://i.imgur.com/BiPbGnc.png
Take a look at the hole and you'll see that some of the walls inside are missing. I've put a second one in the screenshot, which I've hovered on so you can see that it highlights them, but on the other one their not visible.
Cheers.
Thanks for noticing it. It's an old part and effectively the faces for the cross axle hole are inversed. I'll make sure it is corrected when I update the part model.
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