The slam piece stacked won’t fire with spacer

[S4l9h]

I have stacked slam piece and it is not fire when I put 2mm spacer with 2 Samsung 30t batteries and also it is not fire when I put the 30t without spacer it is fire only with I joy 20700 5 legs without spacer

 

[S4l9h]

How can I fix this problem please help

 

[somdcomputerguy]

Welcome to ECF, S4l9h. I guess this is the mod you're talking about, but sorry I have no solutions or suggestions for you. Welcome though.
stacked slam piece at DuckDuckGo

eta: except maybe this is a flat top/button top battery issue?

 

[UncLeJunkLe]

Sounds like the lip on the bottom cup contact is too short so it doesn't reach the side fire contact when using 21700 (or at least the 30T). Contact Purge for solution.