Well! Took care of the Motorhome exhaust routing, now for ours.....

The toilet in the PC has never been a 'rock solid' throne. I had tightened up the mounting bolts, but the base itself never seemed too firm. But hey, beats a bush. But then things shifted, and flushes were difficult.

That wasnt good. Managed to pull the commode sideways enough to enable flushes, no leaks or anything evident. Appeared that the base may be a bit loose, hard to tell. Time to dive in!
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First obstacle was removing the top trim. Removed the commode first, and plugged the hole. All but one of the screws were easy to get out... the forward one by the door not so much.

It was assembled BEFORE installation, and the vice grips were the only way I could grab it. A spot of white paint on the screw head after re-assembly covers any scars you leave on the screw head.

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The base trim is two part. There is a sheet screwed on to the base, with another glued on top. I used a putty knife to remove the top layer, it came off easily.
NOTE: They used -8- stout #12 screws to mount the ring to the base.


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Using the 'Socket drive and screw bit' assembly, most of the inner screws came off easily.

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The ones in the rear corner were tighter. I did not have a 1/4 ratchet wrench, nor one of the 90* ratcheting screw driver in Phillips... so a 1/4 wrench and bit worked slow and steady.


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I found THREE screws held the base to the floor.

( But remember...there were 8 (!) big screws holding the ring to the base.

)
One in the rear -

And two in the front -

And I could wiggle the base a bit,

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Originally the base was put on before the plumbing was installed, with the screws installed through the hole. I am NOT removing the pipe, so a combination of wobble extensions and a u-joint allowed removal.

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So what happened? Poor selection of screw. Looking at the picture below, the screw with the arrows was one of the three hold down screws. About 2 1/2 inches long. Holding a piece of 1/2 plywood against 3/4 plywood, with the threads going into foam after.

Looking closely, you can see a rusty area between the red and green arrows. That was where the 1/2" base plywood was moving around.
Now look at the area between the green and blue arrows. A bit darker, there was not movement of the wood next to it.
But note how much thread there is at the bottom... MAYBE 3 turns? Thats all that was anchored in the 3/4 floor wood.

The remainder (still sorta shiny! ) was bedded in the foam, giving no support. This didnt secure the base to the floor well, and allowed movement.
Time for improvement!
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First, I used a (slightly blurry

) 1/4" drill to put a hole JUST in the base, not floor. I am using 1/4x2" lag bolts with fender washers for fastening.

Then I used a smaller bit, ~3/32, to make a pilot hole in the floor wood. Its only 1 1/2" to the foam, so no need to go deep.

Why did I do so? I want the threads of the bolt to anchor to the floor wood. I want the washer to pinch the base wood to the floor wood. I do NOT want any space between. If the lag threads threaded into the base wood, they would hold a space between it and the floor and NOT allow the washer to clamp down. So thats why the bigger hole in the top piece.
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The finished hold down repair. Solid as a ROCK now. What a good difference.


Reassemble things, and now we are sitting pretty AND SOLID.

I didnt even have to glue the top layer on the base, the trim holds it just fine.
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Hope this is helpful to others that may need to do this repair.
