I heard back from Bus Depot:Happyfolk wrote: The only 10mm valve screws on Bus Depot's site have the same exact photo as the Kolb screws on Pelican Parts site, so maybe Bus Depot's are Kolb? I sent a message to ask them if that is the case. $4.95 each.
"Mike
Thank you for your inquiry. They are Kolb screws. I'm sorry but the supplier doesn't list if they heat treated or not. If I can be of further assistance please don't hesitate to contact me.
Fred Vandegrift
Bus Depot Customer Service"
I also contacted aircooled.net:
"Are these valve adjusting screws made by Kolb, Dansk, genuine VW, ...?
http://vwparts.aircooled.net/10mm-Valve ... 09-451.htm
Thanks!
Mike
Hello Mike,
They come to us from the supplier in bulk without any specific packaging or manufacturer information.
We've never had anyone report quality issues with this item in the past. Is there a reason you are seeking a specific brand?
Sincerely
Stephanie
Customer Care, Aircooled.Net VW Parts"
So their glowing writeup of the screws they're selling on their site is based on..?????
Here's the description of the screws Aircooled.net is selling:
"10mm Valve Adjusting Screw, 1.8 and 2.0L Type 4 Engines, Each, 022-109-451 are NOT the cheap adjusting screws that are not properly made nor heat treated! These are the highest quality adjusters available, for a long life and consistent valve adjusting! Old adjusters often get seized in the rocker arm, a torch and vice grips will get them out, but this method requires their replacement! Adjusting them regularly will ensure they are easy to move. Old adjusters also get irregular wear on the tip, and adjusting the valves can be a challenge when this happens. New adjusters solve this problem!"