The invention relates to a method for preparing enantiomerically pure 4-pyrrolidinophenylbenzyl ether derivatives of formula I:wherein R1, R21, R22, R23, R24 and n are as defined in the description and claims and to intermediates useful in the method of the invention as well as salts thereof. The system has a nail inserter and a plurality of arcuate nails, each nail having a head end and a pointed end. A wire lead may be anchored at a location on the insertion tool. The interoperability of the system with a mason or skilled operator removes much of the manual labor component of brick laying, allowing the mason more time to focus on craftsmanship and quality, thus improving the end product and the overall working conditions of the mason.