Customer support ewas very responsive
Customer support ewas very responsive and polite, the real problem though, the filter which does not fit the Mini 4 Pro (2 filters tried on 2 different drones), was not solved. Nobody could tell how much force shall be applied or why it would make sense to replace the filters. Will return the filters where I bought them together with a hint that they do not work as advertised.
Will buy Freewell filters, they fit perfectly.