Hello! As a newbie, I've got another Primus 71 as the attachments, but found missing part, a screw inside of the lid. I've tried to check the part n. out, and found several posts as; http://www.fogas.se/rwdx/files//71E-71K-71LS.gif Not sure, I think 4079 seems the same one as my Dome style tank lid. The Fettlebox shows many variations of 71 Lids, it's surely same as 'C', and 4072 might 'B', anybody can confirm it? https://www.fettlebox.co.uk/images/cache/primus71.600.jpg I'm looking forward to get -only the screw OR -replacement tank lid as Dome or the elder one, 'B'. BaseCamp-shop listed only 4072, but she doesn't list 4079, so don't know how to purchase/get 4079. If it's hard to find 4079 (or only its screw only anyway) I'll consider to purchase 4072 as the alternative one. For that, should check 4072 & 4079 both are having the same thread in order to use alternatively, because I don't know both can be switched, I've only two 71L one is recent(?!) one which has SRV, so I can't check by myself. Classics world is vvvery deep... I can enjoy the stoves only at my office in this covid19 circumstances, and no time to go out for camping and hiking because of my twins, born year2020, they are still too young... Any advice would be very glad and helpful for me. Thanks and keep safe!