Yes Slash, both will screw into each other but as you say the pitch is slightly different. Easy to get a tap here. http://www.ebay.com.au/itm/HSS-Hand-Tap-Whitworth-BSW-1-4-TPI-20-taper-RH-Sutton-TEC-ESC-/322094231256?hash=item4afe4feed8:g:lG8AAOSw~oFXJzU4
