I am a c4c5 Quadriplegic and I use my elbows to prop me up to do weight shifts and they are starting to really hurt. I'm wondering if anyone has any ideas on adding some adding adding or cushioning to my Invacare TDX SP. I've tried wrapping up some generic foam cushioning using duct tape, however I'm wondering if somebody has any better than my jerryrigged duct tape job.