Drake Installation Question

I installed a Drake last night and everything appears to be ok. The only thing that bothers me is that the tank seems to rock front to back too easily. I'm afraid to tighten the mounting bolts too much and break the tank. Is there something else I can do or should have done to prevent the rocking? Do they sell some type of rubber spacer that can be inserted between the tank and bowl to prevent the rocking.

Thanks
Bob

If you tighten the nuts up evenly, a little at a time, side-to-side, you can get it tight. Now, you don't really want to put any porcelain to porcelain pressure on it, but get it so that it nearly touches on each side and still has a barely perceptable rock; no gritty surface to surface agony!

That's the scariest part of the installation.

The object is to squeeze the rubber doughnut enough to prevent leaks and to seat the tank on the bowl, without cracking either the tank or the bowl. During the tightening process, be sure the tank is coming down parallel with the bowl, by seeing if the tank rocks equally, frontward and backward, and the gap is the same on each side. The initial placement of the tank on the doughnut is important -- be sure it's level to start with. If you want to really overengineer the job, use a feeler gauge to monitor progress. As things draw together, tighten each nut slightly -- maybe 1/8 of a turn -- and give the tank the rock test. If it rocks, tighten again. (These are 1/4-20 threads, so an eighth of a turn works out to 1/160" -- not a huge movement.) All of a sudden it won't rock. Stop.

That's my advice, but I've only installed two of them. Wait to see what someone who's done a few hundred has to say.