I would not replace the rubber with a harder silicone section, I did this on my Golf R and it was horrible. I put up with it for a week or two and then took it out. Vibration all the time (idle / slow speed / high speed.....ALL the time) and even worse when you have the air conditioning on.
An aluminium insert from CTS or 034Motorsports etc is the best compromise. Basically zero vibrations and tightens the movement up significantly.
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