Was just having a look on Trademe here in NZ and came across these from our old friend trx100
No doubt, he's copied the idea from the NVram modules. Not sure if this is the right area for this. I guess If you need a MEMCAL with knock board that this would be a decent alternative.
Just pulled one of them out of a VP '808, with the smaller opening in the case the memcal was jammed in there that tight I almost had to open the case to get it out.
Will have a read of it at some stage and see what it looks like but it'll probably go over the left shoulder. At least this way the original memcal is intact and not messed with!