Spikes; definitely not springs.
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Yikes, I've never seen a place where they worked. There is vertical and horizontal, vibration control. There is also From and TO the source. It's difficult to make points work on both plains and variance of the two..
Have you EVER seen any type of power plant that wasn't isolated. I've never seen one. You ever see one on points? I haven't!
LOL Kinda like steel wheels they never did catch on.. Maybe a BIG dimple roller.
Every time it's a gummy puffer (soft mount) with a hole through the center and longer bolts with washers and springs, on either side of the mount sandwiched between the gummy puffers. You back up and slam it forward or forward and slam it in reverse, the spring compress, while the mounting plate is between silicone wafers. Pretty tough!!
You should see what happens to a typical 4 stroke diesel (5-15 liters) engine that loosed the integrity of a harmonic balancer. Break in half!
You can't make it solid enough, but you can make it soft enough..
Regards