That La Hiff was only on some early models of the Presentation, made
in Maine.

I have had several Presentation models without the La Hiff extendable
spring position. I never checked where they were made. The La Hiff
did work, but hardly worth the extra work needed to make the pendulum
spring adjustable.

73, Joe, K8JP/K5

On 1/7/2022 11:26 PM, D.J.J. Ring, Jr. wrote:

The Vibroplex Presentation key is a wonderful key with its adjustable mainspring (loosen two screws and pull or push the mainspring in or out).

-- 
Regards, Joe, K8JP/V31JP, Ronnie, Martin & Sidney Pontek
175 Diamond Loch Rd., Apt. 5
Gilmer, TX 75644-9374
U.S.A.
903-204-2318 (My TX cellular)

Member FOC-1743 Feb 2001, QCWA-LM21894, OOTC-4607, A1OP, CFO 1055, SKCC-3171T, NAQCC-5798, Flying Pig-2819, FISTS-7625CC951, A1C-2299, SOC 1075, 10-10 22977, PG1915841, CW Rag chewers #21,
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