hotpoint 1000 refuses to spin with full wash still trapped?

its not the resin small bits that somtimes stick,I kno this coz shop did look t that ,but since lost interest.yes i agree ,often the water doesnt fiil properly ,this despite lifting up drain hose at back to prevent back flow.i feel,its likely jus a smal prob,jus need to kno abit how they work and fix it my self,possibly../i mostly use just gth Q setting,usually works fine,and i turn knob for spin cycle as nec/thanks!