Interesting configuration. Why not two 18650?
TrustFire X2 SST-50 4-Mode 1300 Lumens LED Flashlight Black (3x18650)
[FONT=arial,helvetica,sans-serif]Powered by 3x18650 batteries[/FONT],but it is a little expensive
But for this length set-up I prefer 2x 18500.
Mag 4 cell C light with 1" PVC tube ----- < $20
Mag 4 cell C light with 1" PVC tube ----- < $20
... and a long dummy spacer.
4xC = 200mm
3x18350 = 105mm
... and a long dummy spacer.
4xC = 200mm
3x18350 = 105mm
Arrrg... beat me to it
I think the Mag 4C is the perfect host for a *3 18650 torch.
I think you might be mistaken. An unprotected 18650 cell is 65mm long. 3 times 65mm is 195mm giving you 5mm of play.
... and a long dummy spacer.
4xC = 200mm
3x18350 = 105mm