Koopor plus fitting tanks problems

[Jefftow]

Hi
I just got the Koopor plus, so far the only issue I've found is fitting my limitless plus RTDAs on it, lots fiddling before I can get them to screw on.
Anyone else have this issue

 

[crustyfolker]

Found the 510 pin needed lengthening on my Limitless plus or it wouldn't register on a mod. The 510 thread is not long enough so this might be causing your problem, Hope you can sort it an idea is buy one of these to use with the Koopor plus
https://www.fasttech.com/products/0/10010809/3565600-510-heat-dissipation-heat-sink-for-atomizers

 

[Jefftow]

Heat sink below the atty ? Is that to get over the pin problem ?