[Mart]

I'm pretty sure the nuts are done up tight. The larger part of the bolt shank comes right through to the underside of the large flat washer that sits on the upper part of the mount.

Now. Some I bought recently had two different raised portions on the lower mount. They are different diameters to suit different hole diameters. One (the small one in a 40) needs to be trimmed off. If both are in place it makes it difficult to do up properly (Too tight).

If your mounts have both raised rings in place it will be as you describe, too tight. If only one is in place, then I can't advise, other than to say the nut should be tight.

Mart.