The following tools / consumables are recommended for installing and servicing your Payphone CT54;
Long nosed pliers
Can of dismantling lubricant (e.g. "PlusGas", WD40 etc.) and/or emery paper or cloth.
7mm combination spanner.
8mm combination spanner.
20mm combination spanner (handset cord nut).
5mm Allen key.
A small supply of M4 nuts and washers.
A small supply of M5 nuts and washers.
0.062" 2-way Molex connectors (available on eBay for approx £1 each)
Small, flat-bladed electricians screwdriver.
Small Phillips screwdriver.
Electricians side-cutters.
Spare coins! (10p, 20p, 50p and old-style £1)
(The new style £1 coins occasionally seem to work in my CT54, just not as consistently though as the old-style round ones)
In addition, should you need to make any repairs to your CT54, then you may also need access to;
Soldering iron + Solder.
Multi-Meter / Continuity tester.