It is not hard to find a RT-3600 or RT-3610 - but is nearly impossible to
find one that has not been demilitarised.
In performing that job in the RT-3600 two modules, numbers 6 and 7, were taken
out. And without those the RT-3600 cannot be used as a transmitter. Sometimes
these modules can be found separately, but often badly damaged. The micro switches
will often be broken, the whole box can be badly dented as removing was often by
using the supplied screwdriver as a tool to pry them out by sheer force. Also,
when restoring, the modules must be inserted with great care and with the tuning
controls as well as the mechanical transmissions on the modules in a precise
position. Not for the feint of heart, especially if you do not have the
pertaining manual - and even if you do, it's in Dutch.