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Is seating a Travis brick on a Technic pin a legal connection? TLG has used this construction at least once (M-Tron Particular Ionizer's "rotor"), but that was in the early 90s. Will this connection stress the Technic pin?

Here's an example of what I'm referring to from that set:

6923 step 17

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In general, this sort of connection is illegal, but I think that it works fine with a Travis brick. Technic pins must be "in click" in a model, or the pins will be held in compression and can be damaged over time.

Here's a slide from Jamie Barard's classic "Stressing the Elements" presentation that explain the need to have Technic pins in click:

Technic pin in click

And here's the slide that explicitly states that Technic pins should not be used to connect to System bricks:

System brick and Technic pin

Here's an example of a set that didn't keep Technic pins in click and the resulting damage from prolonged storage assembled:

Legoland Germany Promo Set

With all of that said, the four holes that run through the stud connections on the sides of a Travis brick provide ample room for a pin to click into it. This isn't an obvious connection as with a Technic brick, but the fact the pin can move freely inside the brick indicates that it isn't in compression and is simply constrained to remain inside.

I can't speak to whether or not this type of connection would get through a design review today, but I can say with confidence that this wouldn't cause damage to elements. If this is considered "illegal" it would be for other reasons.

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Although technically the connection is illegal, I don't think the pin is under stress. I remember this set from by childhood, and the "rotor" rotated easily, which would not have been the case if the pin was stressed.

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