I've had one of those keys for years now. It's as heavy duty as any other key I've ever had, and for the life of me I can't envision how one would go about bruising themselves on it, unless you're trying to tuck your knees in behind the airboxes. Either that, or we're talking about some unusually meaty calves...I know a few people who have them and they can be a problem. The're in the way. One guy bent it over almost to the breaking point, and once bent you can't straighten without breaking, and 2 others bruised themselves pretty good from hitting it with their leg.
It's a great product and he's a great guy to deal with, I've had four different ones and they've all been great:bigthumbsup:was on ebay browsing and came across these m109 keys check em out!
and this is there web site: