We've a 44:100 ratio pump and had the same problem when we went to use Jeffco epoxy. We talked to Micheal Engineering and they provided us w/ a drawing on how to modify the arm so the ratio would be changed to 25:100..  worked like a charm.. Don't know what happened to the drawing however..

Fwiw..

Jarrett Johnson

 

> Note that what ACS lists on the link below is for a 44:100 ratio
> pump, and our pumps (for Jeffco) are 25:100.  I called and asked
> about the special order 4:1 (25:100) pumps and was quoted $82.25.
>
> The manufacturer's site
> (http://www.michaelengineering.com/sticky_stuff/SSD.html)  indicates that the different ratio pumps have different sized parts, so I presume the 44:100 rebuild kit that ACS lists on their website for $64 would not work with our pumps.  I just called Aerocraft Parts and Michelle says they don't carry the rebuild kits, but suggested I contact the manufacturer.  Michael Engineering (the manufacturer) is closed for the night, so I'm not sure what they offer and for how much.  I'll try to call tomorrow.
>
>  Cheers,
> - Kyrilian