Dnadoa, maybe I can help?
re:
THREAD PROTECTOR (SACRIFICIAL) FOR ANY 510 MOD AND RDA
This adapter from Eleaf is made for the iStick mod but suitable for most any 510 mod / ecig. The 510 - Ego adapter does have a base ring with a diameter of approx 16.5mm with knurled edging making it easier to screw and unscrew to your device.
Ismoka Eleaf 510 - Ego Adapter
Good price: $2.99
Eleaf 510 to eGo Thread Adapter (Connector) by iSmoka
This came with my Ismoka Eleaf istick mod. This adapter was shipped with my istick which has stainless steel harden threads to guard against wear. Ismoka Eleaf realize that when two metal surfaces work against each other in screwing back and forth, the softer metal will be worn. Hence, a loose thread (created from metal degrading through wear) equals no contact/firing of topper.
The above adapter used is a sacrificial goat to prevent a mods female threads from being worn through constant use.
The Ismoka Eleaf 510 - Ego Adapter I use, is a brass base material coated with decorative thin chrome no wear resistant plating.
Cons:
1. Adds height to your mod. However, the flip side is I can get my fat fingers on my RDA Magma bottom casing and quickly unscrew the cap if I wish to.
2. The design of the Ismoka Eleaf 510 - Ego Adapter has a non adjustable center pin.
Bad forethought of design.
I would of gladly paid a little more money if I could of ordered the Ismoka Eleaf 510 - Ego Adapter with an adjustable 510 to 510 center pin. Oh well, companies today are " special people" and we all know companies are not perfect.
Having the knurled knob makes up for no adjustment capabilities. It would have been nice to have both features.
If you have any additional questions, just hit "like" at bottom right hand corner and I will get back to this thread.