MLE charger help

Hi everyone,
a bit suck at moment and hoping someone can help.
We've an old MLE manual firing system, similar to Fire by Wire but analogue manual version.
We've a display coming up, mostly hand fired but need to set of quite a few shells. So we've blown the dust of and sods law dictates we can't find the charger.
Does anyone know the pin outs so we can put one together pretty hasty.
Fairly certain it's a 24v with a 3 pin male XLR plug.
Checked MLE's site and out of stock

Thanks in advance
Rob