Here's the video of some testing with my Avet SX post the conversion I did.
In the test the reel is filled with thirty pound Power Pro spectra and I'm casting a 2 ounce tennis ball, as you can see the reel does not backlash even though I am not thumbing the spool during the cast and I'm consistently casting maybe forty to fifty yards. I could of cast it further but there's limitations due to the size of the lot, and the power lines. I magged the reel with two D61 Neodymium Rare Earth Disc Magnets. You can see the process I followed in detail at my Myspace Fishing blog here at: http://blogs.myspace.com/451418044.