sac streching

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sac streching

Postby stjpumpfan » Fri Apr 21, 2017 7:15 am

I have been a pumper for about 15 years and pump in my stj most of the time. In a couple of hours i can get to about 15+ in circumference. So no i would like to start stretching my sac. ALL of the weights that i see for sale are way under the size of my sac. I do not believe i have seen a 3 inch ring style weight anyplace. So i turn to the stretching gods here on Newart to enlighten me. So what say you all you long in the sac friends?
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Re: sac streching

Postby bignlow » Fri Apr 21, 2017 3:34 pm

Google split shaft collar. An engineering piece for positioning things on rotating shafts on various pieces of machinery. Available in steel and stainless, the bigger ones aren't cheap but probably about the same price as the smaller weights for stretching. The biggest weight seems to be 40mm ID, which isn't big enough for me either so i've had to go down the engineering route.

3-4 June14 002.jpg


3 45mm split shaft collars with a cushion ring below. Takes the edge off and makes the stack longer.There's also a shackle on the top of that stack just for a bit more weight.

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Re: sac streching

Postby mistertld » Sun Apr 23, 2017 2:44 pm

You might want to look into shaft anodes as used on the prop shafts of yachts

The zinc ones are denser.

And they are cheap. Expect to pay under $20 for a 4 lb unit.
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Re: sac streching

Postby pipefitterdom » Tue Apr 25, 2017 10:08 pm

mistertld wrote:You might want to look into shaft anodes as used on the prop shafts of yachts

The zinc ones are denser.

And they are cheap. Expect to pay under $20 for a 4 lb unit.


The practical upshot being, no corrosion!
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