Cable Stack Increments and Add-On Weights: Make Smaller Changes Correctly

First find out what the selector numbers mean

A selector label can show physical stack mass, effective resistance, or a machine-specific scale. Do not assume each plate weighs the number printed beside it, or that all plates in the stack are identical. The top assembly and optional microload mechanisms can follow different conventions.

Ask the manufacturer for the increment at the outlet you use. REP's cable-machine guide explains why pulley ratio matters when interpreting load. If labels already express effective resistance, dividing them again is an error. Keep that convention in your training notes.

Translate a proposed step before buying an accessory

Suppose a machine has physical stack steps of 10 lb and a usual 2:1 output. The approximate handle jump is 5 lb. If that is too coarse for a particular exercise, an approved 5 lb add-on could create an intermediate step of roughly 2.5 lb. The calculation is a planning example, not a claim that every machine accepts that accessory.

At a 1:1 outlet the same physical addition has a different approximate effect. On a machine with several stations, record which outlet the number belongs to. Otherwise an accessory bought for a small trolley increment may feel quite different on a dedicated lat cable.

Built-in microloading is worth comparing

Some machines include small supplementary weights with a defined mounting position and operating method. That can make progression convenient without loose aftermarket parts. Compare the smallest usable increment and how quickly it can be changed, not just whether the feature is advertised.

REP's Adonis-versus-FT-5000 comparison describes included microplates for those models. Confirm the contents of the current package and their effective increment before ordering, because product generations and regional packages can differ.

Mounting compatibility is more than pin diameter

An aftermarket add-on can interfere with shrouds, guide rods, adjacent plates, cables, or the selector mechanism as the stack moves. Matching a pin diameter does not establish adequate engagement, clearance, or supported load. A magnetic attachment likewise needs an approved surface, retention method, and operating condition.

Do not extend a selector pin to hang arbitrary plates from it or insert a partly engaged substitute. If the machine manufacturer does not approve a proposed accessory, treat compatibility as unresolved. A smaller weight does not make an unsupported mounting method automatically acceptable.

Use finer increments for a specific purpose

Small changes are most useful when they fill a real gap between settings. For an exercise performed at a light resistance, a standard stack jump can represent a large percentage increase. For a heavier movement it may be entirely manageable. Your program can also use repetitions or repeated sessions at one setting rather than requiring another accessory immediately.

Record the main selector position, add-on amount, station, and attachment consistently. That lets you reproduce a session without pretending the approximate handle force is laboratory exact. For purchase comparisons, prioritize a machine whose normal increments already suit most of your training, then consider approved microloading for the few movements that need it.

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