How to I rotate a part smoothly?

Hello,

I'm trying to make a spinner which the player stands on to move around the map. I have tried to use BodyGyro and CFrame to do this.

I find that CFrame studders from degree to degree, which doesn't look very aesthetic. This was my attempt at using CFrame to move the part:

local brick = script.Parent
local a = 0
while true do
	wait()
	local a = a + 0.04
	brick.CFrame  = brick.CFrame * CFrame.Angles(0, a ,0)
end

Again, this did work, but it wasn't very smooth.

I couldn't get the BodyGyro attempt to work either. Firstly, because I had to unanchor the block, causing the block to fall out of the map. Secondly, because it just didn't rotate :(

This was my attempt on using BodyGyro to rotate the part:

local brick = script.Parent
local body = script.Parent:FindFirstChild("BodyGyro")
local a = body.CFrame.Y
while true do
	wait()
	local a = a + 1
	body.CFrame = CFrame.Angles(0,a,0)
end

And again, this script didn't work at all :(

I would be grateful if you could help me create this smooth rotating block. Thanks.