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This kit contains two sets of rigging:
The first contains modeled cables that join the isolators.
The second, a set of the individual isolators and pulleys, should you attempt to thread them up with wire or elastic or whatever.
3D printing isn't great at this kind of part, as such, the modeled cables are quite a thick, which might look out of scale, hence the second set individual parts.
The frame is necessary to prevent the parts warping.
Although intended for the trumpeter kit, I've havn't tested it as of yet.