slowgypsy

Don't know if this will help but here's a link to the parts page for your instrument. http://www.steinberger.com/Synapse-Accessory-and-Part-Information.html

Try headlessusa, they might have parts you can use.

The truss rod on Spirit instruments is single action. That said... what do you consider long term storage? Weeks? Months? Years?

I just looked at the Steinberger website and came across this page: http://www.steinberger.com/Synapse-Accessory-and-Part-Information.html

The washer suggestion is a good one. Also, a very very wee bit of oil (not WD) on the screw threads can help as well. Best...

I sell single ball string adapters on ebay under the seller id pwefx21tw. Available in either brass or aluminum for 4 & 5 string bass and 6 string guitar. If you're still in the market for a string adapter, my string adapters work perfectly.