9 9 0 , ▁the ▁c ement ▁rendering ▁was ▁restored ▁to ▁the ▁mill , ▁covering ▁the ▁north , ▁west ▁and ▁south ▁of ▁the ▁tower , ▁as ▁it ▁was ▁when ▁the ▁mill ▁stood ▁in ▁Del ft . ▁The ▁mill ▁was ▁restored ▁in ▁ 2 0 1 1 - 1 2 , ▁with ▁a ▁new ▁stage , ▁cap ▁and ▁s ails . ▁ ▁Description ▁ ▁Het ▁Fort u yn ▁is ▁what ▁the ▁Dutch ▁describe ▁as ▁a ▁" R onde ▁st elling m olen ". ▁It ▁is ▁a ▁six ▁store y ▁tower ▁mill ▁with ▁a ▁stage . ▁The ▁stage ▁in ▁ ▁above ▁ground ▁level . ▁The ▁cap ▁is ▁that ched . ▁The ▁mill ▁is ▁wind ed ▁by ▁tail pole ▁and ▁win ch . ▁The ▁s ails ▁are ▁Common ▁s ails . ▁They ▁have ▁a ▁span ▁of ▁. ▁The ▁s ails ▁are ▁carried ▁on ▁a ▁cast ▁iron ▁wind sh aft , ▁which ▁was ▁cast ▁by ▁the ▁I J zer gi eter ij ▁De ▁Pr ins ▁van ▁O ran je , ▁' s ▁Gra ven h age , ▁South ▁Holland . ▁The ▁wind sh aft ▁also ▁car ries ▁the ▁bra ke ▁wheel ▁which ▁has ▁ 9 2 ▁teeth . ▁This ▁drives ▁a ▁lan tern ▁pin ion ▁wall ower , ▁which ▁has ▁ 3 5 ▁st aves , ▁and ▁is ▁located ▁at ▁the ▁top ▁of ▁the ▁u pr ight ▁sh aft ▁At ▁the ▁bottom ▁of ▁the ▁u pr ight ▁sh aft ▁is ▁the ▁great ▁sp ur ▁wheel , ▁which ▁has ▁ 8 6 ▁teeth . ▁This ▁drives ▁five ▁pairs