On 4/21/2019 12:52 PM, 'Joseph Zeglinski' J.Zeglinski@...
> Hi Mike,
> One thing that always concerns me is whether I can rely on a bubble
> level – of any precision – to be correct when placed on the
> counterweight shaft. I have about 60 lbs at the END of mine, and surely
> there must be “some flex” of the shaft, or even a slight dip in the
> threads at the end of my AP900/1200 mount axis, or its end cap.
Yes, that's a definite possibility. Placing the level as close as
possible to the threaded end of the shaft is best. But there absolutely
could be some mechanical inaccuracy in the shaft.
> So, I
> prefer to place the bubble level right on the mount body itself. There
> should have been one in the design, possibly where the AP nameplate was
That sure would have been nice. Too late now.
> On the DEC balance, I hold the level right on the doveplate edge –
> where the Starrett groove fits nicely along the D-Plate edge - since
> the OTA can flex, especially a truss, according to some.
That's a very good idea.