It seems that Hidden Internal Compression (HIC) systems are becoming more and more popular among freestyle scooter riders. This is because they are simple, cheap, and light compared to SCS systems, which we covered in another tutorial found here: Proto SCS Installation.
The HIC system uses a shim to extend the reach of the fork into the bars and prevent the fork from pulling out of the headtube. The tutorial video in this article uses a Lucky HIC composite shim, Lucky HIC bars, and Lucky HIC oversized clamp, but other HIC systems should work similarly. In terms of true HIC, we've been extremely happy with the Lucky setup.