Horwood Bagshaw PSS owners need to be aware that there are two  different AgriHubs that you will find on the PSS.  Some early PSS machines were made with a different press wheel arm to accommodate the standard SKF BA series 5 hole Agribhub. The wheels on these have a multi-hole pattern so you can also use the 4 hole variant of this hub, but not the 6 hole variant.  All of the PSS Conversions and most new build machines use the Manutec/SKF AgriHub that uses a PSS stub axle (axle has locating holes in it to match the wheel centre position).  This is the most common AgriHub used on the PSS.  The first image below is the Manutec AgriHub (most common), the second image is one of the PSS machines with the SKF BA series 5 hole AgriHub and the third image is an image of the BA series 5 hole hub.