[Satchmo]

Spoke to Roger at Bintel , Melbourne shop. They have some means to have a look via ronchi and further investigation , but there is no routine bench testing of these scopes before they go out besides collimation. I don't think anyone in the country would offer that service.

It must be so hard to choose when one is expecting so much for so little in the way of quality control. What exactly constitutes a dud with a large low cost mass produced mirror? I guess it would take a statistical analysis of large sample to make a judgment if any particular one is outside the tolerance envelope. The two that I tested including Mohammed's suppled to me for testing by an our much loved local OEM telescope maker were not a large enough sample to make a qualified judgment.