The layshaft bearing will have to be proud of the inner face of the gear casing in order to align the gears.
The boss where the idler shaft is located looks more pronounced than on the TC02C, so it is logical that the layshaft bearing should also stand proud by a little more.
The problem of the idler gear fouling the layshaft bearing will arrise if the boss on the idler location plus the amount that the idler gear bearings protrude from the side of the idler is less than the amount that the layshaft bearing protrudes above the inside face of the casing.
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