Yep, he tapped the holes under them for the bolt. Then he drilled the bolt down the center and put a grease fitting in the top. Then you just apply grease with a grease gun and the hydraulic pressure pops them out.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne