Silicone insulator cut from 14G wires, with an added 2mm x 1mm o-ring
It may not be the best long term solution but is working well for now - I might order some better plastic insulators, eg as used on the KF4.

(Note that is an earlier photo I took. In the final fix, I pulled that red insulation up further to ensure it covers as much as possible of the underside of the countersunk screw head. That can be enough for insulation just on its own, but the o-ring makes certain and I think also reduces the risk of the silicone compressing and moving, a risk that Cindy raised.)
I have been meaning to ask you - you've got the Ivogo, have you not had any problems with fluctuating or too-high resistance for TC? I am still not sure if this is a general problem with the Ivogo clones or just a defect in mine.
But yes, even if yours is stable I'd still recommend the brass M3 - with the only caveat being what @cindycated mentioned, we need to be vigilant checking for corrosion on the join of the brass with the aluminium lower deck. If that's not a problem the brass is definitely a winner.
I suppose copper might be even better, and avoid the corrosion risk as well? Although all the ones I can find are only copper plated on top of steel, and I don't know how that would compare resistance-wise. I can see one set of copper plated M3s on eBay so I might get some just to find out. They're from China though so will take 10 days or so to find out.
EDIT: In other sizes they have copped plated brass, which might be best of all worlds. But I can't find any m3x16 in that size
Longest is M3 x 12. I'll get the copper-over-steel anyway, it'll be interesting just to see how they compare to stainless steel on its own. I suppose I could make a copper-over-brass M3 x 16 using one-and-a-bit of the M3 x 12 soldered together, but I don't think I'll bother for now
Not to mention that they've got the wrong heads, not countersunk.
It may not be the best long term solution but is working well for now - I might order some better plastic insulators, eg as used on the KF4.

(Note that is an earlier photo I took. In the final fix, I pulled that red insulation up further to ensure it covers as much as possible of the underside of the countersunk screw head. That can be enough for insulation just on its own, but the o-ring makes certain and I think also reduces the risk of the silicone compressing and moving, a risk that Cindy raised.)
I have been meaning to ask you - you've got the Ivogo, have you not had any problems with fluctuating or too-high resistance for TC? I am still not sure if this is a general problem with the Ivogo clones or just a defect in mine.
But yes, even if yours is stable I'd still recommend the brass M3 - with the only caveat being what @cindycated mentioned, we need to be vigilant checking for corrosion on the join of the brass with the aluminium lower deck. If that's not a problem the brass is definitely a winner.
I suppose copper might be even better, and avoid the corrosion risk as well? Although all the ones I can find are only copper plated on top of steel, and I don't know how that would compare resistance-wise. I can see one set of copper plated M3s on eBay so I might get some just to find out. They're from China though so will take 10 days or so to find out.
EDIT: In other sizes they have copped plated brass, which might be best of all worlds. But I can't find any m3x16 in that size
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