Ordered new ball joints and went out to replace them today. Didn't open the box till I had the lower A arm off. Found they sent the wrong ones. Return for replacement no problem. But, the service manual I have shows that front lower ball joint is pressed into the bottom of the Strut casting and held with a plate and couple screws. Mine does not have that plate, no holes for screws or anything similar. Is this ball joint a tight press fit into that casting? If so what holds it in? Thanks in advance for any info on this.