Prism T20s coils suddenly don't fit

[Ratfinkz]

I've been having trouble with one of my prism T20s tank in that when I put the coil in I can't screw the driptip on, or if I do it pushes the coil back out. I have two of the tanks and they were working fine. I just thought I wonder if I've got a dodgy replacement coil and tried the coil i was using in the broken tank, it didn't work but most annoyingly it won't go back in the tank that was working fine either. Hubby has also tried but can't sort anything!

I'm so confused what's going on and would appreciate any advice, i searched but couldn't find anything!

Please forgive horrible typing, drugged up on strong painkillers and antisickness (legally I must add!).

[Perpetua]

I'm not really au fait with this tank Ratfinkz . . .  have you definitely got the correct coils as there's the T20 and T20s and they're not compatible between the two designs.

Just a thought.

[Ratfinkz]

Oh my goodness, no I havent! But, they adds an extra mystery - how we're they fitting in the first place?!

[Perpetua]

Are these a new batch you've bought Sarah? Or was your original tank actually a T20 and not a T20s?

More questions than answers from me I'm afraid!  

[Ratfinkz]

No, they're the same. I literally took a coil out that had been working and then couldn't put the same one back in the same tank! At least I know what the issue is now, thank you!