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Your secondary is tiny, even by old school standards. Was that selection by trial and error or a set design method?
Think I'd be shot if I went near a sink with grits/rogues... The lounge room is the only 1 climate room I have big enough to setup the Ronchi test.
the other option is the garage... then I have to keep a jug going for warm water and temp's vary a lot over the day etc... The smoothing onwards was in the kitchen as I try and not have carpet under foot while working.
Can I ask what you used as your spider? Atm I'm tempted to use either .7mm thick 90cent steel ruler from office works and go a single curved arm. Or get some sub .1mm black wire and do a suspension job.
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