I'm going to expose my naivety here (again ) but I wonder how important the aspects of weight and balance are in fact. I DIY'd my Techie platter to stop ringing and any eddy currents emanating from the motor (which were once expressed here as having a possible adverse effect on the cartridge) by covering the rubber underside of the platter first with a thin layer of self adhesive copper - this was put on in at least two pieces as I could only find the copper sheet in narrow widths. I followed this up with another layer of the bitumen coated aluminium and soft 'plastic' stuff called flashing tape (from Wickes ) . This has added considerably to the weight, as you might imagine but it has certainly stopped the ringing.
It is generally accepted that the Techie is greatly over engineered to enable it to survive in it's original market, namely mobile, temporary, DJ sessions. FWIW my stock PSU has also been upgraded to an off-board Paul Hynes ancient PSR3 which was designed to be supplied by an 18v transformer but when my transformer died (of old age), with Paul's blessing it is now supplied by a 15v R-core transformer. The platter still gets up to speed 'immediately', is rock steady maintaining speed and stops 'dead' when powered down. I have run it continuously for hours just to see if anything changed and it remained cool and stable.
And, to my ears, each of these mods proved beneficial to SQ.
I have a basically original bearing housing but I have provided it with permanent support from underneath. I also have replaced the standard feet with 100mm sorbothane hemispheres - basically a very modified Techie but all DIY. The tonearm wire, tonearm itself and platter mat have also been changed, and the various layers of the deck have been bonded together to aid rigidity. Still recognisable as a Techie though .
I will now get behind the sofa to avoid the 'incoming'.
Dave.