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If you're having a difficult time getting them in, wait until you try to get them out! I actually got so tired of them and got a set of billet pads from madvet.com. Many swear by the rectangular pucks but I don't want to be driving around with them permanently installed or have to carry a putty knife and screwdriver to get them out. You should be able to snap them in though without any tools. Make sure the pin is all the way out. Then you can also push them in one side at a time. I had to rock mine back and forth a few times to get them in. Good luck.
Sabooher, are you talking about this one (below) from Madvet?
$19.99 Jack Up Your 1997-07 With Confidence
Don't risk damaging your 1997-07 Corvette when you need to jack it up! Simply remove your floor jack's cradle and slide this Jack Insert in its place. Then locate your Corvette's jacking points in the frame, insert the tip and jack it up. Instructions included.
I've had mine in and out a few times and on one occasion, I had some trouble putting two of them in (it just took a little more effort). Taking them out can involve some serious prying so I modified mine per a previous post in the forum.
I slightly drilled-out the center pins and then screwed some small, brass screws into the center pins leaving the screw heads and some of the screw shaft sticking-out. This makes it far easier to grasp and pull out the center pins with pliers or a Leatherman Tool.
I will not leave my jacking pucks in 24/7. If my car ever needs to be towed, they will need to use the oval frame slots to load and secure your car on a flatbed. If my car breaks-down and needs to be towed, I'm already PO'd. I don't need the added aggravation of having to lay in the dirt/mud along the edge of a busy road and mess-around trying to remove the jacking pucks (before they can 'tow' my car). I'd much rather snap them in once I get the car to the service facility. Far safer and much less aggravation IMO.
Mine was flat bedded "WITH" the pucks in and "NO" damage or difficulty was encountered when flatbedded! Just make sure they bring boards so the front end doesn't get overly scratched up.
There was damage to the bottom rail next to the rear puck, which occured at the stealership. It seems they can't raise a car properly even with the pucks in...jerks!!!
Nothing hits them and no one has ever noticed them. If I ever have to get towed, I'll pull 'em out. It's more likely that the car will be lifted on a hoist than it will be towed (I hope!!)
Be sure the "tab" is aligned with the frame hole properly and the retaining pin is pulled back and they should snap right in.
Perplexing that yours are not snapping easily into place. I installed mine in the BMW lot on my way to the GM dealership for service. I simply aligned them and struck them with the palm of my hand till it snapped and locked.