The ziptie plugs are exellent for that purpose also. Today I blocked the second grill hole on my customers diesel Smart. No holes needed and the assembly and diassembly is easy. Costs of the plugs are 2€ per piece. That includes one 300mm long ziptie and one ziptie plug. At the moment I mill those plugs from aluminium by hand so it takes time.
So 20 ziptie plugs will cost shipped on letter to states 40€ which is 55 US$. Smaller than 20 piece orders there will be 2€ shipping cost.
I will try to make a grill block assembly video with ziptie plugs tomorrow.
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