Brettski19 was right - the plug is 17mm, not 14 as I previously stated. I have ordered 2 plugs, one for Suzuki and one for Speedy - 17 is for Speedy. Perfect fit.
Anyway, here is a pic of the magnetic tip at oil change (interval 600 to 1200 miles, end of break-in). Clearly visible ferrous shavings, magnet works perfectly. Below I enclosed pic of magnets on the oil filter that I use in addition to magnetic plug - effective and inexpensive additional protection.
