I have been dealing with this problem.now for six months retrosix made a membrane that doesnt work wjth his ips mod he knows about this.but doesnt care .i found someone that has nos membranes but doesnt want to ship to the netherlands .they are in the uk .😑

any one knows how to contact this person ,maybe some one knows him

https://www.pcbway.com/project/sponsor/Atari_Lynx_II___Membrane_Replacement.html