EDIT: added requested height comparison pics below, here If you are like some who have drilled out the slider inside Whelljacks legs to make him taller, you may be in need of a way to make him stop flapping around. After much experimentation and looking at many fixes online, I came up with my own fix, and without using anything from Tracks, but based on how his legs work..even though his needed help as well. All you need are some plastic parts to glue and shape, it serves a function as well as cosmetics. It fills in the emptiness of WJ's legs and will stop the flailing leg syndrome, all you need is patience and glue. And best of all no Tracks' were harmed during the making of this tutorial! Also there is a second part for those who have done the mod where you cut his fenders free and glue them to the feet / car nose, to fill in the gap on the newly opened side. More on this at the end..... Start By taking his legs apart by removing the 2 screws. Sand the inside of the black part to promote glue adhesion for all that is about to be done. Take the black part and cut a piece of plastic that will fit inside the gap but will when the leg is slid down sit just below the thigh part, and glue it in. Sand the section outside of the plastic where you just glued in that piece for another step to come. Cut 2 similar plastic strips that will glue inside the part to hold the leg firm from side to side motions. Cut the strips down and shape to the leg part. Take a thicker piece of plastic wide enough to cover the section where you glued in the strip across inside the leg and tall enough to touch the leg slider when pulled out to your desired height. Cut a section out of it in a square shape to make the piece a squared "U" shape Then line it up and glue it on. Also this is why you sanded the outside earlier. (notice the plastic I glued onto the side to thicken his leg up and to cover the hollowness of the leg, to fill it out like Tracks' legs, on an earlier mod I did) Then Shape it however you like to blend it in. Now Just Paint however you like and reassemble the leg, I painted mine black. Also I didn't show......don't know why, but you have to glue strips inside the track the leg slider rides in, above the screw post at the top of the hood section / leg front to further make the slider tight and the leg not flop around. Above the screw post gluing flush with the depth of the track will not hinder the slider in anyway, just makes it tighter. I made a pic to demonstrate since I forgot to photo that step. (For the cut off fenders mod hollowness fix) All I did was cut a strip to glue to the tab that the black piece slots into to cover the gap now seen since the fenders have been cut off. And shape it to fit the curve of the cut and to aloow the black part to go back on flush. Final Pics: How it looks transformed.