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To rivnut into grp? I have searched for grp rivnuts to no avail! the only thing I found that may work is plastic rivnuts but I can only find them as part of a kit for £60! and I only need about 8.
That’s surprisingly poor! Did you establish which firm Ric H used? I guess the problem with the washers, is that the GRP is already quite thick, so with the washers the expanding section of the rivnut ends up in the middle of the grp. Could you not bond in some flanged nuts?