I recently extracted some old powdered San Pedro from Compras Peru I found...it was bit old, got it around a year ago.

I got a very low yield (230mg), although I did mess up and somehow manage to throw the limonene away from the first soak after just one vinegar pull (was distracted, talking at the time...d'oh). However I mixed it well and let it soak for ages.

It formed some really nice crystals on the plate, will try and get a photo up - but on scraping it up I found it MUCH harder to handle then my peruvian torch extract. The San Pedro extract is much darker in appearance, and much more tarry, sticky, and goes more liquidy on handling...the torch extract was much easier to handle and put into gel caps, and is more likely to be a purer source of mescaline.

So if your finding handling the end product tricky, maybe give torch a shot.