fixed 

Ermm i'm not a pro, but vtc mini should have enough power for TFV4.. I'm using RX200 now and still firing less than 20 watt. I also have vtc mini, it have 75watt max.

I think unless you gonna play with very low ohm, multiple coils, otherwise vtc mini should be ok

really? how about juice flow? suck a lot too? right now 30ml can last me 2 week with Lemo 2, now need start save up for RX200, hopefully good review coming up this week.

Heads up: the dual o-rings at the mad hatter mini's base are very weak. One slight nudge and the body can go out of position or become detached entirely. Suggest u get slightly fatter o-rings from fasttech at the same time. The 2 original red o-rings are approx 17mm outer diameter and slightly under 1mm thickness.

Suggest u try https://www.fasttech.com/products/0/1000643...garette-10-pack
Those o-rings are 1.5mm thickness, so should make for a tighter fit.

I'm making do with winding a bit of dental floss around the original o-rings    It's a good RDA...very flavorful and handy to flip the top open and drip.

Bro..there are NO 0.5mm thickness o-rings used on the TFV4.

You're probably referring to the 11mm outer diameter, 1mm thickness o-ring used at the RBA base and at the chimney:

https://www.fasttech.com/products/0/1000643...garette-20-pack

For the RBA base, I ended up using a 1.5mm thick o-ring. It's tougher and can better withstand the sharp edges in the base assembly (despite my efforts to sand them down slightly) than that flimsy useless piece of silicone crap which came with the coils/RBAs. It's a slightly tight fit, but it works very well.

If u wish, u can try those 1mm o-rings from the spare parts shop. It beats waiting for the slow boat from China. If they're made of nitrile rubber, they should last you a long time.

Bro..I think you've mixed things up. It's late and my brain is a bit sleepy but I don't think I've ever mentioned a 0.5mm thick o-ring before. It's always been 11mm outer diameter and 1mm thick for the one that comes on the coils and RBAs.

The sanding down was done on a 2mm o-ring to get it to 1mm, but that didn't work out too well, so I ditched it. I managed to find 1.5mm thick o-rings at a bearing and seal shop, and that's what I'm using.

Well I hope it works for your TFV4 mini...I'm using the full-sized version with stock single coil RBA and 2 pcs dual coil RBAs (faster to switch when coils get gunked). I didn't comment on yr leakage prob cos I have no experience with the mini version. Are your stock silicone o-rings still in good shape, or were they chewed up/worn out from use? If they're in good shape and fit right, it may be a wicking prob which is causing the leak.

I once sleepily rewicked at 5AM and it was a sloppy job...some juice dripped out till I vaped like mad  That's why I have 2 dual coil RBAs...there's always a properly-wicked spare for quick swaps while half asleep.
Under normal circumstances, I fill up on juice with the AFC wide open, no problems.

My chimney's o-ring is still stock...it's the base threading that keeps cutting the silicone o-ring to shreds. I believe Smok made a bad decision to use the same flimsy o-rings in the RBAs as the OCCs. OCCs are meant for short-term use so they'd be discarded, but an RBA undergoes much longer use. They should have given tougher o-rings for the RBA.