New towbars are generally fitted with standard shank length towballs and when a towing stabiliser, some types of bike racks, backing guides etc are fitted, the tow ball shank is often found to be too short. Common sense and wof regulations require that towball shanks extend to the bottom of the nut and split washers securing them to the tow bar and people frequently come to us after warrant of fitness failure to have this problem corrected.
The solution is usually simple; Megatyre stocks a selection of all the available long shank towball options with 65 mm lengths available for 2000 kg 3/4 shank balls and for 3500 kg 3/4 and 50 mm 1 inch shank balls. We unbolt the old towball and fit a new long shank replacement. If a 65 mm shank still is not long enough, you will need to explore other options.
Or you can mail order a long shank towball for from $19.00 inc gst plus $4.50 postage. https://megatyre.co.nz/content/3towbars/towbar-accessories/towballs-accessories/
Megatyre Towbars, Browns Bay, North Shore, Auckland. www.megatyre.co.nz