Thanks for the tips. But with tz85 showing Classic HK out of stock message and all the recs also out of stock I'm putting a banebots order in for a pair of wheels , boxes and shafts and then a HK for the 1000k and possibly some 1200. Robot shop was the alternative but I'm opting for the dual 550/700 banebots version so I can reuse them if needed for a HW.