38 Ton Shay Pickup Roller Installation Advice

[TrailsideGguy]

I'm in the process of installing the pickup rollers into the gearbox holder of the rear truck and to say the least it's a tight fit. It should just snap into place but that's not happening. Knowing how fragile the plastic is on the gearboxes I'm reluctant to force it. Anyone have experience getting these in place without breaking the plastic?