CHAPTER 20 ■ COUPLER■ Caution During gluing, wear vinyl or nitrile (not latex) gloves. Enough skin exposure to epoxy resin leads to
an allergic reaction.
Follow the directions on the package. Mix the epoxy on a scrap piece of paper. Spread a thin coat on
the outside of a cut tube and insert it into a larger tube. As each tube is inserted, twist the tube to spread the
epoxy evenly throughout.
When the coupler tubing is completely assembled, twirl the end of the LEGO axle in the epoxy on the
scrap piece of paper. Get a big glob of epoxy on the end and make sure it fills the notches in the axle. As the
axle is inserted into the tubing, twist and pump the axle to distribute the epoxy throughout the inside of
the tubing. The idea here is to have the epoxy fill all the space between the “X” shape of the axle and the
“O” shape of the tubing.
Give the epoxy plenty of time to dry. The package on the epoxy I use reads, “full strength in 1 hour.”
Figure 20-17. Devcon All Purpose 5 Minute Epoxy