This part is really quite optional, and I might actually advise against it depending on the situation and environment you might be using the scrubber in, as well as how often it will be used. If I could do it again, I would have built the scrubber without cement or glue before I committed to using them, mostly due to potential for screwing up the project (and injuries).

-The benefit to not using glue or cement is that if one part breaks later on or if you accidentally miscut the 'turf, you can simply disassemble the scrubber and reassemble it with a new part, rather than building an entirely new one from scratch. In my case, it was that I did not insert the 'turf fast enough after putting the hot glue in, causing me to scrunch it and twist it quite a bit to get it in as the glue was already solidifying. I also sustained some minor glue burns in the process.

-The benfit to the hot glue is that it insures that the astroturf cannot slide out when the scrubber is being used and lubricated with gratuitous amounts of water. However, in practice, I didn't really find that much difference in slippage between the non-hot glue version and the glue version(remember I made 3 models, with slightly differing construction methods). The downward action of the rope, pressure of the water, and spring-like uncoiling action of the 'turf piece in the tee provided sufficient friction to prevent it from sliding out.



That being said:

Using a well-heated (and full of glue, don't you hate it when you run out half-way through making a line of glue?) glue gun, make a single ring of glue just inside the tee on one end. Quickly push the 'turf through from the opposite side. You should push the 'turf piece past the end with the glue in it so that the end is sticking out about a half inch. Then, put another ring of glue on the inside of the currently un-glued end, and push the 'turf piece back into position. This will reduce the amount of time needed and also makes for a more even hold. Unfortunately, I tried to put glue on one end, push the 'turf through from the same end, and then glue it again on the opposite end. It ended up smearing the glue into a thin film on the inside, which caused it to cool and solidify very quickly, jamming the 'turf in halfway, and I had to pretty much muscle the thing into the correct position with my thumbs and the aid of a screwdriver. Nonetheless, it works quite well.