I finally got around to adding a pinhole to the Mamiya TLR.
Snuck into a rear lens mount it sits in the same position as the meniscus lens behind the shutter - which makes framing a doddle as what you see is pretty much what you're getting.
Meniscus lens
Pinhole
Today was the first day in many, many months that freetime has coincided with suntime. The last roll of 120 was dev'd in September, so that's a severe gap in the workflow.