Cheers pal
I had a wee accident on a previous car with a grooved hockey puck. Because the trolley jack head is a fair bit smaller than the underside of the puck, if not mm perfectly central it'll slip under load and went through body ouch. Perfect for like a Costco big head trolley jack, but not my little low clearance amazon offering sadly.
Front jacking point I tend to use here and for the rear, the diff with a piece of wood.
Yes pal, right drama's getting rid of the air out of the cylinder itself, primed and job done!!