Hi, I'm building a 13" Dob of the style of Kriege&Berry.
I fat-fingered my order for aluminum poles and stupidly ordered 6 instead of 8. Now I had resigned myself to paying shipping again on two more poles, but then the thought occurred to me that I had read about all the new-fangled designs like Merope or other Stewart Platforms that only use 6 poles. I've already made my mirror cell that assumes collimation bolts so I don't plan on taking advantage of a Stewart Platform.
I will probably attempt block-style wood clamps on the outside of the mirror box as pictured below. This means I can do any angle I want.
I've read a couple threads here indicating a 6-pole truss is just as strong. I've made my secondary rings with an inner diameter of 13.75" for the 13.1" mirror. The aluminum I bought is 1" OD, 0.058 thickness.
If there were truly no downsides I might just attempt the 6-pole truss rather than buying 2 more poles. But if the 8-pole truss is really stronger, then I'll just order 2 more poles.