| or input of thought into their design. Using a single through bolt does nothing to isolate vibration into the polyurethane. Sure, it will allow you to preload the poly in compression but vibration is something that occurs in two (or more) directions and so tension also needs to be considered. Lets look at what happens when a tension load or compressiion load that exceeds the preload is applied to these things: Tension - it's all in the bolt, it might as well be a solid mount because there is no tension cushion provided by the bushing here. Compression - if enough load is applied via engine torque to cause the poly to compress more than the installed preload, the bolt will then be loose in the system and when the load is removed there will be a "thunk" as the slack is taken up again. I see bolt threads sawing away at the chassis slot or broken parts from the shock loading. Mounts designed like this are not true vibration isolators. 
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01:08:38 04/16/14
FYI - the "LEVEL ZERO" on those mounts = ZERO engineering - 
