Now that JM website is back on...

Now that JM website is back on...

Joined: January 7th, 2006, 5:01 am

September 18th, 2006, 9:06 pm #1

from what I heard a tarantula spring should work on my S1k but it would also require chnages and fitting some stuff. What would I need to do in order to get everything fitting perfect.
Thanks for the help,
Noel
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Joined: February 14th, 2006, 4:12 pm

September 18th, 2006, 9:42 pm #2

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Joined: January 7th, 2006, 5:01 am

September 18th, 2006, 10:24 pm #3

RWS94-Cometa 400- Phoenix Kit fit in my S1k if it does I think I have found my replacement kit.
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Joined: May 2nd, 2006, 4:27 am

September 18th, 2006, 11:03 pm #4

This is NOT a drop in mod. there are modifactions to do before the spring fits.

And if you were going to use the spring you need just the spring not a kit from JM. The kit fits the rifle it was intended for not a Gamo.

The trantula spring is what every body else is using but this take a different spring guides because the spring I.D. is different that a stock Gamo spring
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Joined: October 21st, 2001, 3:36 am

September 18th, 2006, 11:55 pm #5

the Stock tophats are loose at the top to begin with. Correct me if I'm wrong but IIRC they have @ least .020 play, unacceptable to me when I'm going through the trouble of pulling the gun apart and tuning it up.



Last edited by bigbore on September 19th, 2006, 1:25 am, edited 1 time in total.
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Joined: October 21st, 2001, 3:36 am

September 19th, 2006, 5:35 am #6

I just checked the measurements, my CF-X tophat had a LARGE O.D. of .745 and the piston has an I.D. of .825. That is .080 of TWANG!

You want to put in stock parts? If you can find tighter stock parts than that show me, I want a tighter fit than that!

Until I see someone MEASURE stock parts that are better than that; "Hello Rich........guide kit please"!

Last edited by bigbore on September 19th, 2006, 5:36 am, edited 1 time in total.
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Joined: February 14th, 2006, 4:12 pm

September 19th, 2006, 1:34 pm #7

a lot of trouble to grind down the tophat, when all he really needed to do was cut the plastic rear spacer.
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Joined: October 21st, 2001, 3:36 am

September 19th, 2006, 1:43 pm #8

I prefer a caliper. I'm not say it's not true but if these guns are using the same internals then there is WAY too much slop in the tophat. You can get a smaller diameter spring to fit tight on the guide but it will still be floating around inside the piston like a "Jack-in-the-box".

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Joined: October 8th, 2003, 12:41 pm

September 19th, 2006, 3:01 pm #9

I just checked the measurements, my CF-X tophat had a LARGE O.D. of .745 and the piston has an I.D. of .825. That is .080 of TWANG!

You want to put in stock parts? If you can find tighter stock parts than that show me, I want a tighter fit than that!

Until I see someone MEASURE stock parts that are better than that; "Hello Rich........guide kit please"!

when the tophat vibrates against the inside of the piston?
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Joined: October 21st, 2001, 3:36 am

September 20th, 2006, 12:44 am #10

chuck one of your tophats up in a lathe, trim it down to the O.D. of the spring, and report back.

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