Question about Magnacraft Optisan Telescope and Microscope Set

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I lost instrucyions to viviatr 900x microscope set belonging to my 9 yr old how can i obtain instructions so that he can use set

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I think it very easy to operate.Or you go through www.celestron.com.You will find same type of produts & menuals.

Posted on Jul 12, 2011

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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How old is my model 94 winchesterand value serial no. 2173630


I need to explain that he was also the one who had migrated to utilizing the Home windows software ahead of the rest of us. AmanStino Lightning Cable Apple MFi Certified 1M Nylon Braided Charging...

Jan 09, 2017 | Optics

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Harrington richardson arms


You didn\'t state what make, or type (pistol, revolver, rifle or shotgun) of H&R you have, so I can only give generalizations.



As a general rule, centerfire rifle\'s and handgun\'s firing pin protrusion usually measure between .050" and .060".

Shotguns are a little longer at .055" to .065".

Rimfire guns usually fall into the .028" to .035" range.





Once you have established that the firing pin protrusion is within an acceptable range, you can get a rough idea of hammer spring strength by looking at the primer on some fired rounds for how deep and pronounced the indent is.



Also, you mentioned that some brand(s) of ammo fired more reliably than others.



Some ammo requires a harder "hit" from the firing pin to ignite the primer.

This has to do with factors such as the alloy composition of the primer "cup" (some are harder than others, requiring a harder "hit"), some primer compounds are more sensitive than others, etc.



So maybe experiment with different brands and see which ammo works best for you.

Aug 28, 2014 | Optics

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