I built two or maybe three Heathkit keyers across the70s and 80s.
The first was the big shoe-box sized thing, the HD-10. It had the worlds worst paddle - the microswitches were about as responsive as lamp switches and their clicking just about drowned out CW sidetone.
Then, not long before Heathkit went under, I bought and built the HD1410, which seemed like a huge advancement. But, once I operated at another station that had a Morsematic keyer with a Vibroplex paddle I realized I never wanted a keyer with a paddle sticking out of it!
But, it also worked for many years and survived many Field Day operations across many generations of HF rigs.
73 John K3TN