Need Help Snapping Reset Switch in Place

Opened up my 1521 to clean and lubricate the fan spindle, and now trying to re-assemble everything. I’ve been stuck for way too long trying to get the reset switch to seat, it just will not snap into place. I placed the switch so that it just needs to be pushed about 1/16 inch into the plastic housing, but it will not budge. On the attached image, you can see that the bottom has engaged the white tab and is being held in place, red arrows. But on the top, blue arrow, the switch just will not snap under the tab. I’ve tried over and over again, but no luck. Is there a trick to getting this to snap into place?

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