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I found a picture simular like mine , you see the bearing runs to the housing :
but i watch your pictures and notice some difference the bearing holder you use is different than original
that i have from airtripper
and also the drive gear looks to me different , i got the MK8.
could this be the reason than ?
is it possible to post the bearing holder ?
i buy al the original parts from airtripper , so i has wondered why it doesn't fit.

airtripper mod for rubber printing