Escutcheon problems

[jnd]

Is there a "trick" to installing the aftermarket escutcheon/washers that fit between trim panel assembly and the inside door handles & window cranks on the 67-71 pick-ups? We have purchased 12 in the past few weeks from various vendors and each one cracked/split around the seam found on the circumference of the part. In fact a couple split before we even had them installed in the panel. Thanks.