I designed and built an oversized bolt knob for my T1x and have 10 extras. All I'm asking is for you to cover actual shipping costs. I'll drop it in a small bubble mailer and ship via USPS. The first 10 people to PM me their address will get one - then I'll ship it and PM you what the shipping cost was and my Paypal info.
To install: Unscrew your bolt handle with a 3mm hex key, put a couple drops of oil on the knob, slide the oversized knob over the handle and then use some muscle and your workbench to pop it on. Once it's on, it's on, so proceed with caution then simply reattach your bolt handle