If your spikes aren't big enough then the head can spin and wear away at the plastic... if you make huge spikes (and hammer them into the plastic before securely fastening with the bolt) then you shouldn't have a problem.
@JonoMarshall started
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If your spikes aren't big enough then the head can spin and wear away at the plastic... if you make huge spikes (and hammer them into the plastic before securely fastening with the bolt) then you shouldn't have a problem.