Yeah still got the saw attachment, it's actually just hiding behind one of Scar's drive motors in the Carcinus pic. Never got the business end of it sorted out so it'd need a bit of work, but I'll draw some inspiration from Gloomy and try to get it working

Used the same bike tyre on Banebots hubs on Reaver at the champs and it seemed to work fine. No maintenance required, although DB10 did dissect one of them quite nicely.