Secondary collimation screws

[bomberbaz]

Hello all. Does anyone know the size of the screws for the secondary of the heritage 130 please.

Also is there anything I should be aware of when swapping out for Bob's nobs!

Tia

Steve

[AstroNebulee]

I don't know the size of them but could be worth sending an email to @FLOand seeing what they say too.

 

Lee 

[bosun21]

8 hours ago, bomberbaz said:

Also is there anything I should be aware of when swapping out for Bob's nobs!

Tia

Swap them over one at a time. Carefully remove one screw and replace with the Bobs Knob screw and screw it in slowly until it just makes contact with the secondary holder. Repeat this with the remaining two Bobs knobs screws. Once all three are done just nip them up but not too tight. Check the collimation and tweak if necessary.

[Coco]

Tried a vernier gauge Steve? 

My dob was M4 35mm long, works a treat..

I bought these from Ali £6.97 delivered 3 weeks.
https://www.aliexpress.com/item/1005004072392997.html?spm=a2g0o.productlist.main.1.543d5fc5xR0k5r&algo_pvid=ccb7b305-4194-40f9-8406-e4b9430a1c57&algo_exp_id=ccb7b305-4194-40f9-8406-e4b9430a1c57-0&pdp_npi=3%40dis!GBP!0.57!0.48!!!0.70!!%402100b5dc16887102784785943d0773!12000027945791773!sea!UK!0&curPageLogUid=W39BiiGJdc80

 

[Spile]

On the 200P I used 30mm M4

[bosun21]

On my 12” SL dobsonian I bought the 35mm M4 bobs knobs. On reflection I could have fitted the 30mm M4 as the 35mm ones are a little too long for my OCD. 

[Ratlet]

7 hours ago, bosun21 said:

On my 12” SL dobsonian I bought the 35mm M4 bobs knobs. On reflection I could have fitted the 30mm M4 as the 35mm ones are a little too long for my OCD. 

I've got a 10" Stellalyra and a 130pds.  Same experience as bosun.  They fit under the protective lid, but they are a bit on the long side.

I just ordered ones from AliExpress since it works out about 10xcheaper than bobs knobs.

https://a.aliexpress.com/_mLSQMA8

Edited July 8, 2023 by Ratlet

[bomberbaz]

Thanks for the replies. It seems 30mm M4 are the required size, always helps to have things confirmed. 

Steve