Action flange crushing

[Ron Nossaman]

>  But it seems quite conceivable to me that if you had a major change in 
> humidity from the installation level then the flange is going to swell 
> and be crushed.  If this is in fact going to damage the flange then 
> perhaps the screw shouldn't have been put in that tight to begin with.
>
>Regards,
>
>Phil Ford

That's the reasoning behind the spring washers recently discussed here. 
Once installed, they would keep the flange tight enough for a long time if 
left alone. But then annual tightening of screws in dry seasons will make 
spring washers superfluous too.

Ron N