Toby
I would keep the link. It is a good link, indirect but worthy of keeping. Takes so much effort to get a link nowadays that I hold on to them like gold when I get one. I check links with open site explorer.
Moving away from content have you considered reviewing the title tag & h1. The word molded x 3 appears in the title and it does not appear 3 x relevant to search. ie more people are googling "custom" in the uk. Your first paragraph is more empathetic to what customers are typing in than your title tag. Semrush is a great tool to have a look at for keywords and there are countless articles on it.
https://moz.com/learn/seo/on-page-factors
A bit of a tweak with your title tag and h1 and that may also assist on search volume. It is a niche area so I think you could get some upside.
Hope this assists.