Elon Musk has found a way to ramp up Tesla deliveries without spending a dime: enlisting volunteers who own Teslas.

Musk invited current Tesla owners to show up at the company's delivery centers starting on Saturday and help answer questions from new buyers picking up their vehicles, Bloomberg reports. The effort to expedite sales and deliveries before the end of the third quarter appears to have been organized over Twitter, after a Tesla customer tweeted to Musk last Friday that he would be "delighted" to help with deliveries for free. Musk replied the help would be "super appreciated."

Some Tesla owners were happy to heed Musk's call. "We're complementary to the Tesla employees," Omar Sultan, a Tesla customer who volunteered this weekend at the Tesla store near Rocklin, California, told Bloomberg. "A lot of people getting the Model 3 are buying an electric car for the first time, and they have a lot of questions about charging that we're happy to answer."

Musk has been under pressure for months to prove that Tesla's business is sustainable. He told shareholders in August that Tesla would be profitable and cash-flow positive in the second half of 2018. Over the summer, Tesla laid off more than 3,000 employees--or 9 percent of its workforce--to cut down costs. The company has experienced so many delays in getting vehicles to customers that Musk recently referred to the situation as "delivery logistics hell."

Tesla will report third-quarter production and delivery results in early October.