Currently, tech allies work by giving 10% of whatever you tech to your allies (limited to 10% of their current tech points). Example of how it currently works:

I have 1000 TPT.
My 3 allies have 500, 1000 and 5000 TPT.
If my 3 allies each tech one turn, I gain 50 tech, 100 tech and 500 tech respectively.
Similarly, if I tech one turn, each of my allies also gain 100, 100 and 100 tech respectively.

[Edit: The above assumes that each person in the tech ring has at least 10x as much tech as would be gained from tech allies.]

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I propose to change this to be reversed: Whenever I spend a turn to tech, none of my tech allies gain tech. Instead, I gain 10% of my allies TPT (limited to 10% of my TPT).

Example:
I have 1000 TPT.
My 3 allies have 500, 1000 and 5000 TPT.
If my 3 allies tech one turn each, they each gain an additional 50, 100 and 100 tech from being allied to me respectively.
Similarly, if I tech one turn, I gain 50, 100 and 100 bonus tech respectively.

What this solves is tech leeching.

The player receiving the tech has to spend his turns teching. If all 4 players tech all their turns, then the amount of tech generated for each player isn't changed much at all.