Hello.
I know I will be mocked that I should't bought hybrid for flush 510 attys, I didn't buy it for that. But I was wondering. Is there any way to make flush attys safe for hybrids? Like something like those 510 heat spreaders could work if they have protruding or adjustable 510. I found a way to make Nautilus 2 work without that but it isn't something I'd trust (taking off the rubber from coil threading and screw the coil as hard as possible - that makes the centerpin protrude a bit as it is pushed from the coil out) but I'd like to know some safer method.
RE: "Is there any way to make flush attys safe for hybrids?"
"Safe" is very much dependant on the user and their ability to think/understand variables (all variables). In general a hybrid, more specifically direct to battery mech is probably not gonna be "safe" for most folks regardless because the industry has for the most part transitioned to mods with multiple fail-safes. Most users don't want to understand the variables much less consider the potential, they just "want something that works".
My first mod was direct-to-battery mech (first was a single 18650, second was a dual parrallel) so what I feel is safe I would say is not for the average vaper of today. Take anything I say here with disclaimer that "you" should NOT try, only presented as anecdotal (my experiences with direct consideration of the specifics of equipment involved).
There are numerous ways one could solve your question depending on the specifics of equipment (atty, mod, battery):
1) Intall a longer 510 pin/screw (meaning the head is longer) into atty such the the center-pin contact extends safely past the outter contact.
2) Install shim between 510 screw & base (to extend contact of center-pin safely past the outter contact). May, or may not, require a longer 510 pin.
3) Add material (example: silver solder) to extend center-pin length safely past the outter contact.
4) Intall atty spacer, aka finned heat sink, between atty & mod. Spacer needs some type of adjustable/floating, etc. center-pin based on the specifics of atty, mod, battery being used. Photo example below.
In all referenced examples 510 extensions must not be allowed to make contact with outter contact resulting in a hard-short.
Photo attached is one example of floating-center-pin spacer (in this case also a heat-sink). In this example the top-side (atty-side) floating 510 is manually pushed up, atty attached forcing floating 510 into working position, then atty/spacer is attached to mod, and battery securement tension is set achieving center pin connection from battery thru spacer to atty. ("floating 510" in this case means it moves up & down, but requires fair amount of force to do so, some are spring-loaded). If a different atty is attached the process sequence must be repeated, otherwise the center-pin may have fault/failure including but not limited to;
1) not make electrical contact (atty center-pin is shorter than initial atty).
2) could damage battery (atty center-pin is longer than initial atty).
3) could short the mod (continuous firing).
Additionally, the atty spacer in this photo creates a barrier/separator so that juice from tanks bottom-side air-flow does not pass into/onto battery. Any leaking juice (from bottom-side air-flow) stops at spacer, and/or runs down side of device instead of into/onto battery.
Additional disclaimer:
We can help ignorant, but can't fix stupid ;-)