Thanks for that timely reminder, Gyula. I knew I had read it before but could not get the search engine to find it.
So, in effect you deepened the tapped hole in the pressed-in spacer, once it was refixed in place with cyanoacrylate glue, such that the screw now also engages your extended thread on the heatsink base? If I have understood your description accurately it would essentially be the same as my suggestion to Ashhar that HF Signals taps the base of the heatsink and uses a separate spacer.
Cyanoacrylate glue is commonly known as superglue here in VK but in its most frequently found fairly liquid form does require a close fit for reliable adhesion. I guess some of the gell types might be less demanding in that regard. It was that concern that led me to think about using epoxy resin, with its inherent gap-filling properties. The other alternative idea?,thread lock or Loctite type product, I didn't favour as they tend to need a relatively airtight fit before they will cure.
I like your added security provided by the washer and spring washer allowed by the 10mm screw length.
Your tapped spacers hadn't actually lifted out of the heatsink when your V2 arrived? One of mine had, and Joe reports a similar case. Collectively though, our three experiences indicate that a mod along these lines needs to be adopted by the factory as a priority, I would suggest.
73
Bill VK7MX & VK1MX
