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have a old avery bait pump with large diameter stainless steel tube its a killer when pumping for worms what is the best diameter to have when pumping to stop me from getting arthiritus i have seen blokes using copper piping but what diamiter PLEASE HELP CRIPPLED BAIT PUMPER:giveup:
 

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have a old avery bait pump with large diameter stainless steel tube its a killer when pumping for worms what is the best diameter to have when pumping to stop me from getting arthiritus i have seen blokes using copper piping but what diamiter PLEASE HELP CRIPPLED BAIT PUMPER:giveup:
I cannibalised my Avery pump and stuck the innards into 22ml copper pipe, works alot better for me, so I got some stainless rod from the internet, got a local smithy to thread the bottom and weld a handle on, It's longer and better on my back.

This is how I was told to make mastic washers for the new pump.

cut some copper pipe to about 2 inches smear inside with butter then fill it up with clear mastic ( must be the clear stuff ) leave to cure for ten days, then drill hole through centre put a screw with washer in, immerse in hot water for a while and pull plug from tubing, cut to size, this you will have to gauge against the thread end to incorporate your stainless washers lock nut and two 1/2 flat rubber tap washers, the silicone plug will go between the tap washers, don't overtighten, leave a bit loose.

Strip the Avery down to give you an idea of what I mean, any probs and I will strip my one down and take a couple of pics.

You can use stainless tubing but the copper is cheaper, the only hassle with the copper is it does tend to burr over, but long nosed pliers sorts that out.

I'm not a pro digger but will always get what I need, and I find the smaller bore alot easier.
 
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