Doing unpaid work, especially on bollocks like threaded headsets can often blow up in your face. Lets say the op tries to quickly adjust it as a favour to the customer. A week later, it shits itself, so the customer (lets call him Stevie) is in the shop having a screaming match with the manager saying the op caused the damage. The OP is off that day so can’t defend himself or explain that he just looked at it.
He’s gonna go on Facebook, he’s gonna go on twitter blah blah blah, so before you know it the manager’s making the work shop drop all current jobs, so this asshole will leave the shop, he’s out time, and parts, and he wants to know why the op was doing free work on Stevie’s bike.
Or a month later his headset shits itself while he’s commuting, he gets distracted, falls and he breaks his arm. Stevie’s solicitor is on the phone to the OP’s manager….who is asking the op what he did to the customer’s bike and why he didn’t charge.
Or the OP inspects the headset but can’t tell without investigating further…so he phones Stevie but can’t get through. So he decides to go the extra mile and just quickly take it apart, but lo and behold the bearing cage falls apart and he’s got a handful of rusty scrap, and perhaps doesn’t have any spare bearings. So now they need ordered in and it’ll take a week. He phones Stevie, Stevie goes ballistic. He only wanted it looked at, not expensive labour and parts. He doesn’t want to pay. So now the OP’s c*** of a manager needs to get involved…..you can see where I’m going.
The customers who demand the most / expect stuff done for free are often the ones who have the least loyalty or will be the first to kick off, either in the shop or via the internet. I’ve seen it time and time again. It’s doesn’t matter what the job is, in the customers eyes it’s “just a simple job”.
“My hub is making a noise, will you take a quick look a it?” Hub probably ****ed
“My brakes are rubbing will you take a quick look at it?” Brakes probably need bled.
“My frame is making a clunking sound” Your Lapierre is broken.