Fuel tank dimple dies???

[TerryWighs]

I am working on fuel tanks. I have seen reference to "fuel tank dimple dies"??? So far, I have been unsuccessful in finding this specialty tool part or if using this dimple die is really necessary?
Can anyone clear this up for me?

[N526JS]

Ckeveland has them. You will want to use them as they make a slightly deeper dimple so that the rivets will sit flush with the sealant (ProSeal) under them.

http://www.cleavelandtoolstore.com/p...umber=DIE4263T

[TerryWighs]

Thanks Jim...

[vmirv8bldr]

Got mine from Avery.....

One note: The slightly deeper dimple combine with the slight lubricating effect of proseal means you can silde off these much easier with the flush set and can get it going at a slight angle. Just be extra cautious about keeping the rivet gun perpendicular when you pull the trigger.