tunnel
If you look close enough, the mountain is at the end and I have a large opening for retractionating disencumbering parts of various and sundry wheeled velocipides as may happenstance entering and being restrained from coming out for some nonsensicle reason. However, I digress. The whole end is covered by a sheet of foam cut to shape and held in place. I merely lift it, or if necessary, set it aside, to get in for maintenance or whatever.
I had better pictures but they wouldn't post. I'll try again tomorrw to show the end,
Lynn