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minahasa: +1
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dragra:
it most likely has nothing to do with more or less precision in manufacturing. Beginning of the 1990s, your problem was a common one with many 3rd party lenses designed by reverse engineering of the K and KA mount. These companies saw the actual state only, not knowing which future modifications of the mount Pentax would do.
In this case, the small box with the contacts for the voltage supply for power zooms is blocking. With DSLRs, the same contacts are used for SDM (I think).
I remember I had to return a Sigma mini wide II (28mm) because of this problem. Sigma changed the design after Pentax introduced the Z/PZ series in 1991, which were the first to support Power Zoom.
It is not impossible you have damaged these contacts by using the force you described. You will only find out if you use a SDM lens.
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fuent104:
The SF-10 was from the SF series which did not offer the Power Zoom contacts yet.