Been out of pocket for a few weeks, at least WRT to free time to stay caught up on the forums, but no problem, glad you like them.
They are usually sized to accept a 6mm hex bolt. I bought stainless steel 6mm bolts from Lowe's for mine in the Liquid Gold.
No shilling, Richard really goes out of the way to help and I think he bumped those EHHA units up a frame to keep the regulation tighter IIRC. He's working on 3 customs for me right now and I have 5 more I need to order for other projects. I know one is going up two sizes to really tighten the regulation since I have the room to fit a big 6" diameter can.
I like Jack at Electra-Print too, but his bigger VA jobbies are just too costly and you need to set them out in the garage for a week to off-gas the varnish fumes. Theory holds that toroids will pass all their noise through since they are wide band, but even with X10 home automation protocol sitting on my powerline at 120KHz, I can't hear any noise coming through my SumRs and I do not run filtered IEC inlets, I just use PowerCons. I found a custom R-core winder, but they don't sell to individuals and they are nowhere near as easy to deal with as Richard. Great custom R-cores and good service, but so far SumR has come out on top for me and he's so price competitive with the other two (R-cores and E-P) as well. If I run into a noise issue, I'll go R-cores, but I have a PS Audio Solo now too, so I don't see that being necessary.
And O/T, but my Tang Band drivers showed up yesterday from Planet10 Audio.
I haven't even opened the box yet though, been too busy.