Devised, researched
 and written
  Peter King Smith BSc

                                                         The mid-1960s, German-built multi-track tape recorder with FM/AM/SW radio

How the spindle was made

Machine-tooled pulley
To make the dual pulley for the take-up spool/drum back in 1978, Jim took a piece of brass rod, turned it on a lathe, so that its diameter was about 0.025 inches smaller than the original pulley, shaped it with a file while it was still on the lathe, polished it with fine emery paper, and then bored a hole using a dark (blued) steel drill (important) up the middle of the pulley, with exactly the same diameter as the hole that ran through the original pulley.

He then parted it off, leaving one end flat.

Then, using the drill as a guide to exactly line up the two holes, he put one pulley above the other using a little soldering flux on their contact faces,
gently heated the assembly with a small blowtorch and ran a bit of solder where the two pulleys joined.

The final size of the new, double spindle is approximately 3 cms (see photo in Jim Weir: Lord of The Rings).

Thus, the new, smaller-diameter spindle became the long-play one (LP or 30-min mode), and the pulley's larger spindle remained the default one (22-min mode).