I have been looking at a home made scarifier using snowmobile carbide tips or self tapping screws . I do not have a huge area to address...maybe an acre total. Using the full 72" FEL width may not get enough pressure on the studs. Considering using 1/4x20 self tapping screws about 2-3" apart on a length of 48" angle iron. The angle iron would be mounted to a SSQA plate and screws would go through the angle iron with the tips protruding onto the ice.
I get ice two to three times a year. Even if I had to replace the screws every time, it would take less than 5 minutes, cost less than $10, and still be viable for my needs.
Has anyone done something like this or have a better idea?