The Flentrop organ (19IIP, 1956) underwent a major overhaul. The organ was completely cleaned, wereby the pipes were temporarily removed. The mechanical action and the windsupply were inspected, repaired and adjusted. After thorough cleaning and restoring the flue pipes, voicing was leveled and checked, the voicing of the reed stops was significantly improved.

In 1969 Ernst Leeflang built an organ (II/P, 15 stops) for the Netherlands Reformed Congregation of IJsselmonde. The sound and wind system were, as usual with this builder, very rigid. In the autumn of 2009 Van den Heuvel-Orgelbouw rebuild the original wind system (all the leather of the Schwimmers were replaced) and crafted a new classic bellow placed behind the organ. The windtrunks and regulation was modified. The manuals was restored with new bushings and a large part of the key overlays were renewed. All was followed by a major overhaul of the pipework and voicingd, making the organ sounds now warmer and richer.

The organ was built in 1906 by L. Ypma & Co. This builder included older materials. In 1922 a restauration followed by N.A. van Dam. J. de Koff & sohn rebuilt the orggan completely in 1952. In 1980 J.L. van den Heuvel received the commission to restore the organ once again.

In 2009 Van den Heuvel releathered the bellow and replaced the blower.  Besides this the organ was cleaned and the voicing checked.

The organ in Betlehem-church was built by Blank in 1976. In 2009 Van den Heuvel carried out restoration work (wooden pipes, wind supply, action) and cleaned the instrument. They also stabilised pipe work (flue-pipes and resonators). Afterwards the voicing was improved.