at parties i look at it this way.
if you do all the work and i help you to learn. just buy the parts or if you have them bring them with and you can use all my tools to get the job done free.
if i do all the work then i ask for some trade/money but not the full amount like if you mailed me the chassis to do at home.
this is a party and we are all here to learn but a little comp for my time is not too much to ask.
i don't want to exclude anybody from getting their stuff fixed but if your chassis takes several hours of dedicated time then that is not fair to others with problems at the party.
as far as i am concerned we can hit the buffet for the trade i like to eat

like many others a 6 pac is usually what is given but i don't drink

they don't call me Buffett for nothing
i like helping others and see their stuff fixed and letting folks use the right equipment for the job.
hope this explains what you were asking.
please bring your stuff to work and do the work on it so you can learn how to get it fixed knowledge is always free. plus i learn new things from everybody that comes at every party.
Peace
Buffett