I've found with my GC's that the solid top mount makes surprisingly little difference on normal bumps but you REALLY feel it on larger sharp edged potholes and bumps.
I doubt 3mm of rubber would make much difference at all in these cases but it would be interesting for someone to try with and without this.
Resident grumpy old fart
VW - Metallic Paint, Radial Tyres, Laminated Windscreen, Electric Windows, VW Alloy Wheels, Variable Geometry Exhaust Driven Supercharger, Direct Unit Fuel Injection, Adiabatic Ignition, MacPherson Struts front, Torsion Beam rear, Coil Springs, Hydraulic Dampers, Front Anti-Roll Bar, Disc Brakes, Bosch ECU, ABS
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