I've had a couple of my Topres make clacking sounds from the space bar, too. The solution is to put something around the stabilizer so that the bottom of the keycap doesn't make contact with the stabilizer housing. All you do is to cut a 1/2" square piece of some kind of thin soft material, like a piece of a paper towel, and cut a slit in it for the stabilizer to poke through. Set it over the stabilizer so that the stabilizer post is sticking through the slit, put your keycap back on, and the clack should be gone. I had to do this on a regular Realforce and a Type Heaven when I put PBT space bars on them, and also on an RGB when a Tai Hao PBT space bar clacked a little bit.