Step 4Inserting and Tightening Up
We now need to insert the bolt and tighten it.
This can be a little tricky.
Insert the first washer leaving the other outside the wall.
We now need to tighten the bolt.
This is where the pliers, spanner and tape come in.
Take your tape and wrap it firmly around the exposed thread. Put enough on it, so the pliers will not damage it when gripped.
Grip the taped thread with some force and use the spanner to tighten the nut.
Not much pressure is required to sandwich the wall, so you should not damage the thread.
We're almost there!!
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Take a spare nut and cut through one of the corners (between two of the flats where the spanner goes) with a hacksaw. The nut should now look like a circle with a gap in it.
Screw the nut onto the thread and squeeze the nut against the bolt with a pair of visegrips.
This will grip well but won't damage the thread.
Gripping through the ball may work. It does not take my tension to tighten against the skin of the ball, you could almost do it by hand.
In regards to how you should do it properly. You should get another two nuts "lock" them together on the exposed thread, grip them with a spanner then use another one the tighten the lower nut.