[...] I am not surprised, wasn’t it around 2012 these heads changed from blocked open stud (triangle) to hollow stud? (9 months ago, Aug 30, 2023, to Catalog Requests)
[...] We can't add a variant, nor a relationship, before this Head with Blocked Open stud is added to the catalog. Since you have this head, you can 1. add it to the [...] (8 months ago, Sep 19, 2023, to Catalog Requests)
[...] Since the stud version will cease to be relevant on Bricklink shortly I have discarded this request. Thanks, Paul. (4 months ago, Feb 3, 2024, to Catalog Requests)