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Malcolm,
By using the soft plastic, all that is being done is protect the secondary housing, but not changing the issue created by a gouged surface and the play in the spider hub. Instead it is making things worse because the gouged plastic will slowly deform under the pressure from the collimation screws and the play in the spider hub. Ultimately it is a problem that needs more drastic solutions or the unstable secondary assembly will not be solved.
Alex.
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