« Reply #1 on: May 12, 2010, 12:18:36 PM »
Welcome aboard Jason. Your question is a very popular question here on the GTA. My answer is you can use a tarantula spring and apex seal from JM. But the piston will not take a larger spring. The wire on the tarantula springs is high in quality and much more stable than the Chinese springs that Crosman uses. The apex seals are made of poly instead of nylon which will conform to the combustion chamber much better and last much longer as long as you do not shoot light wt pellets.
A CDT Turbo Tune is based on performance and not based on higher fps. Follow his tuning instructions and use the parts I mentioned and you will end up with at very nice shooter. If you do not have access to a lathe to make a custom delrin spring guide or new custom top hat, you will need to substitute the tarantula spring with a 3650 spring. Your stock guide and top hatwould be to loose for the tarantula spring.
When we tune springers we make new custom top hats and custom spring guides to fit the new tarantula springs. This may not be mentioned in CDT's B-19 guide. Along with a GRT and a turbo tune you will have one sweet shooter on your hands..... Best of luck....

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THE ONES I SLEEP WITH: BSA Lightning XL, AA TX-200, AA ProSport, BSA Ultra, HW-97K, Crosman NPSS .177, FX Cyclone, HW-30 Nicle Plated, AA-S200, Crosman Marauder, CZ-634, R-9 DG, Webley/Scott UK Tomahawk, Benji Kantana, Benji Marauder, Benji Discovery.....
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