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Old 05-10-2006, 08:35 PM   #1 (permalink)
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Sterling Velocity Adjustment

So I may have a lead on a Sterling, but I don't know much about them. They appear to be missing from VintageRex as well. I know the Bronze ones didn't have an external velocity adjustment, but what about the STP's ?
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Old 05-10-2006, 09:24 PM   #2 (permalink)
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The newest ones(vertical feed stp) have a velocity adjuster accessed by a long hex tool. It threads through a small hole in the front of the pump handle and then through the pump guide rod and then you are able to adjust the valve spring tension to change your velocity.
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Old 05-10-2006, 11:57 PM   #3 (permalink)
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Here's a good site for Sterling info...

http://www.geocities.com/lea_wu/sterling/
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Old 05-11-2006, 12:36 AM   #4 (permalink)
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The older STP (up through the Arrow Precision version made just before the switch to vertical feed) does not have a velocity adjuster. They are most commonly adjusted either by swapping springs or by running a reg of some sort (which is what I did).
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Old 05-11-2006, 03:12 AM   #5 (permalink)
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I got a spyder spring set, and cut the springs down to have a couple different main springs. I have also used shims to a great success. Actually they were washers. 8-32 size I think, slide right into the pickup and gave me about 10fps per washer.

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Old 05-11-2006, 12:02 PM   #6 (permalink)
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Most older sterlings can be seen with a PPS stabilizer attached by a bottom line, that will help you adjust your velocity, springs are an option but only worth getting it near to what you want then use the stab for fine tuning.
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