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Good question JD though I don't know the correct answer.
The ADR approved frames have a solid base so any foam seat base insert will be sitting atop a metal platform to start with.
Does this answer the question?
Hadn't queried the trimmer on foam grades but was reliant on their experience, which
is considerable.
Still worth the question however, though I suspect they will be able to answer this directly.
Steve
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slowy
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