“Glue for silicone”: Toolcraft Ropid 150 no. 886514 (www.conrad.at, .de, .ch, .com)
Orings: https://www.oringsandmore.com/
Oring lubricant: https://www.banggood.com/50g-High-quality-Grease-lubricating-Oil-for-Flashlight-p-86083.html?p=6S2910081756201209IA&custlinkid=877601