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Yes those springs could be frustrating and also potentially dangerous.
G'day vint_mow & Gadge
I think there was a real concern with backyard repairers
hurting themselves -even when the spring case had a
caution notice on it!

The new designed starters started to enter the market in about 1963.
I should also note that the new design didn't just use a low energy spring
(that was removable from its alloy case), but the new design had an
extra safety feature - a separate trip release lever.

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I found it interesting that when I asked someone who had a Victa Impulse starter for the measurements (between the adjacent and opposite holes), it was completely different.
That is very probable, given that Victa used both types.
In fact, Victa used adapter plates on a number of models to
compensate for the different mounting points to the cowl.

Here is the SC KX-D starter on a 1960 Victa 4-star with Kirby Lauson engine.
It, of course, used the finer teeth starter cup.

[Linked Image]

On this 1965 Mayfair note the new design starter with an adapter plate:-

[Linked Image]

For the record, the wind-up starter was by far the most common starter
used in the 1960s. This includes Victa 2-strokes (which had no decompressors).

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Jack