For 50 quid you will be buying tat.
Even 2nd hand it will still be tat.
Your asking for a silk purse from a sows ear.
Use an improvised bean bag and save up some cash.
On the whole...Harris does hat it says on the tin. You need to decide if you want pan and tilt and if the legs are to be notched or locked with the thumb wheel.
Harris are oft.copied. never bettered.
Like many I have trodden the path and wasted shed loads on tat kit. Its pointless and it will let you down.
My harris is well old now. Never let me down and is as good.now as the day I bought it.
Even 2nd hand...a harris is likely to serve you better than a cheapo that looks like a harris.
You will find something that will get you through but really....buy once. Buy right.