Here the main deck has been rigged up on the first side of the bridge, and all that remains is to use the gun and a kitchen knife to apply a filet down the side opposite that with the weights.
If you're not confident at applying these sort of seals, what I used to do was offer to install a friend's bathroom ~ practising on sides of the bath, toilet and basin ~ then leaving on the pretext of a dental appointment.
There are fast-cure adhesives out there, although they tend to cost twice the price and so we'll call this a day for now.
If you wanted to produce lots of these in short order, you'd assemble what is called a 'jig' that you can drop all parts into for fixing together... but then Rome wasn't built in a day, was it?
So let's have a cup of tea and a Bakewell tart instead, eh Gromit?
