Adding hovertool to a second Y axis with bokeh python

This is a example of what I have so far, just for ilustration.

import numpy as np
from bokeh.models import ColumnDataSource, Range1d, LinearAxis, HoverTool
from bokeh.plotting import figure, output_file, show
import pandas as pd
import datetime

base_df = pd.DataFrame()
ini = datetime.datetime.today().date()
base_df['Date'] = [ini - datetime.timedelta(days=x) for x in range(0, 60)]
base_df['Y_axis_1'] = [np.random.random()*100 for x in range(0, 60)]
base_df['Y_axis_2'] = [np.random.random()*100 + 100 for x in range(0, 60)]
TOOLS = "pan,wheel_zoom,box_zoom,reset,save"
xdr = Range1d(start=0, end=100)
yplt = Range1d(start=100, end=0)

source = ColumnDataSource(base_df)

plot = figure(tools=TOOLS, toolbar_location="above", logo=None, y_range=yplt, plot_width=1200, plot_height=700, title='Multi_Yaxis_hover', x_axis_type='datetime')
plot.background_fill_color = "#dddddd"
plot.xaxis.axis_label = "Date"
plot.yaxis.axis_label = "Range_1"
plot.grid.grid_line_color = "white"

plot.triangle('Date', 'Y_axis_1', size=6, source=source, color='green', line_color="green", fill_alpha=0.8, legend='Axis_Y_1')

plot.extra_y_ranges = {"foo": Range1d(start=100, end=200)}
plot.add_layout(LinearAxis(y_range_name="foo", axis_label="Range_2",), 'right')

plot.circle(base_df.Date, base_df.Y_axis_2, y_range_name='foo', color='brown', legend='Axis_Y_2')
hover1 = HoverTool(tooltips=[("Value", "@Y_axis_1"), ("Date", "@Date{%F}")],
                   formatters={'Date': 'datetime'}, mode='mouse', line_policy='nearest')
plot.add_tools(hover1)

output_file('Multi_Yaxis_hover.html', title='Multi_Yaxis_hover example')

show(plot)

I tried to set a second hovertool to the extra Y axis just like in the code below:

hover2 = HoverTool(tooltips=[("Value", "@Y_axis_2"), ("Date", "@Date{%F}")],
                   formatters={'Date': 'datetime'}, mode='mouse', line_policy='nearest')
plot.add_tools(hover2)

But it doesn't have effect over the second axis, only over the first. How Do I set hovertool to the second Y axis? Thanks