I mean what’s the use of this insulator? It helps form the current sheath I’ve read, but it seems to be a source of headache, why not just have an insulator gap at the base? This would be easier to machine and some design parameters and optimizing would be reduced, I think. Is it really essential to the function of a DPF? Even the filippov design has the insulator going up the side, why not just gap the bottom?
